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Northern Illinois is a region generally covering the northern third of the
U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sover ...
of
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
. The region is by far the most populous of Illinois with nearly 9.7 million residents as of 2010.


Economics

Northern Illinois is dominated by the metropolitan areas of
Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...
, the
Quad Cities The Quad Cities is a region of cities (originally four, see History) in the U.S. states of Iowa and Illinois: Davenport and Bettendorf in southeastern Iowa, and Rock Island, Moline and East Moline in northwestern Illinois. These cities are t ...
, and Rockford, which contain a majority (over 75%) of Illinois' population and economic activity, including numerous Fortune 500 companies and a heavy manufacturing, commercial, retail, service, and office based economy. Much of the economic activity of the region is centered in the
Chicago Loop The Loop, one of Chicago's 77 designated community areas, is the central business district of the city and is the main section of Downtown Chicago. Home to Chicago's commercial core, it is the second largest commercial business district in Nort ...
, the
Illinois Technology and Research Corridor Illinois ( ) is a state in the Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolitan areas include, Peoria and Rockfor ...
, and the
Golden Corridor The Golden Corridor is the area around the Jane Addams Memorial Tollway ( Interstate 90), formerly known as the Northwest Tollway, in the Chicago metropolitan area. Its name refers to the "gold" mine of economic profit for communities in the area. ...
. However, rural sections of this region are highly productive agriculturally, and are part of the
Corn Belt The Corn Belt is a region of the Midwestern United States that, since the 1850s, has dominated corn production in the United States. In the United States, ''corn'' is the common word for maize. More generally, the concept of the Corn Belt con ...
. The headquarters for
John Deere Deere & Company, doing business as John Deere (), is an American corporation that manufactures agricultural machinery, heavy equipment, forestry machinery, diesel engines, drivetrains (axles, transmissions, gearboxes) used in heavy equipment, ...
farming equipment are located in Moline. Additional smaller cities in this area include Kankakee, LaSalle-
Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...
,
Ottawa Ottawa (, ; Canadian French: ) is the capital city of Canada. It is located at the confluence of the Ottawa River and the Rideau River in the southern portion of the province of Ontario. Ottawa borders Gatineau, Quebec, and forms the core ...
, Freeport, Dixon, and Sterling- Rock Falls, which still have predominantly manufacturing and agricultural economies. Northern Illinois is also one of the world's busiest freight railroad and truck traffic corridors.


Interstate 80 southern boundary

Interstate 80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from downtown San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one o ...
is sometimes referenced as the informal southern boundary of Northern Illinois, and is often used in weather reports as a reference point, as in "south of Interstate 80 will see sleet and rain, but north of Interstate 80 can expect mostly snow."


Interstate 88 cross section

Interstate 88 (the
Ronald Reagan Memorial Tollway Interstate 88 (I-88) is an Interstate Highway in the US state of Illinois that runs from an interchange with I-80 near Silvis and Moline to an interchange with I-290 and I-294 in Hillside, near Chicago. I-88 is long. This route is no ...
) connects the region, east-west, stretching from the Quad Cities, eastward through Sterling-Rock Falls, Dixon, DeKalb,
Aurora An aurora (plural: auroras or aurorae), also commonly known as the polar lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras display dynamic patterns of bri ...
,
Naperville Naperville ( ) is a city in DuPage County, Illinois, DuPage and Will County, Illinois, Will counties in the U.S. state of Illinois. It is in the Chicago metro area, west of the city. Naperville was founded in 1831 by Joseph Naper. The city was ...
, and into Chicago. Northern Illinois is also the only region of the state in which there are tollways, which are run by the
Illinois State Toll Highway Authority The Illinois State Toll Highway Authority (ISTHA) is an administrative agency of the U.S. state of Illinois charged with building, operating, and maintaining toll roads in the state. The roads, as well as the authority itself, are sometimes referr ...
, another trait separating this region from Central and Southern Illinois.


Education

Northern Illinois University Northern Illinois University (NIU) is a public research university in DeKalb, Illinois. It was founded as Northern Illinois State Normal School on May 22, 1895, by Illinois Governor John P. Altgeld as part of an expansion of the state's system ...
(NIU), in
DeKalb, IL DeKalb ( ) is a city in DeKalb County, Illinois, United States. The population was 43,862 according to the 2010 census, up from 39,018 at the 2000 census. The city is named after decorated Franconian-French war hero Johann de Kalb, who died d ...
, is located at the heart of Northern Illinois and is the state's second largest institute of higher education. According to the Regional History Center at NIU, their area of service to the northern portion of Illinois includes the 18 northernmost counties, excluding Cook, Grundy, Kankakee, Mercer and Rock Island Counties, which are covered by Eastern Illinois University and Western Illinois University, respectively, and University of Illinois at Chicago. Several major colleges can be found in the Chicago area including Illinois' third largest state school, the
University of Illinois at Chicago The University of Illinois Chicago (UIC) is a Public university, public research university in Chicago, Illinois. Its campus is in the Near West Side, Chicago, Near West Side community area, adjacent to the Chicago Loop. The second campus esta ...
, as well as the
University of Chicago The University of Chicago (UChicago, Chicago, U of C, or UChi) is a private research university in Chicago, Illinois. Its main campus is located in Chicago's Hyde Park neighborhood. The University of Chicago is consistently ranked among the b ...
and
Northwestern University Northwestern University is a private research university in Evanston, Illinois. Founded in 1851, Northwestern is the oldest chartered university in Illinois and is ranked among the most prestigious academic institutions in the world. Charte ...
. Other notable schools include the
Illinois Institute of Technology Illinois Institute of Technology (IIT) is a private research university in Chicago, Illinois. Tracing its history to 1890, the present name was adopted upon the merger of the Armour Institute and Lewis Institute in 1940. The university has prog ...
, Loyola University,
DePaul University DePaul University is a private university, private, Catholic higher education, Catholic research university in Chicago, Illinois. Founded by the Congregation of the Mission, Vincentians in 1898, the university takes its name from the 17th-centu ...
, Columbia College,
Northeastern Illinois University Northeastern Illinois University (NEIU) is a public university in Chicago, Illinois. NEIU serves approximately 9,000 students in the region and is a Hispanic-serving institution. The main campus is located in the community area of North Park wi ...
, and
Roosevelt University Roosevelt University is a private university with campuses in Chicago and Schaumburg, Illinois. Founded in 1945, the university was named in honor of United States President Franklin Delano Roosevelt and First Lady Eleanor Roosevelt. The unive ...
. Several liberal arts schools such as
Aurora University Aurora University (AU) is a private university in Aurora, Illinois. In addition to its main campus and the Orchard Center in Aurora, AU offers programs online, at its George Williams College campus in Williams Bay, Wisconsin, and at the Woodsto ...
,
Lewis University Lewis University is a private Roman Catholic and Lasallian university in Romeoville, Illinois, United States. The enrollment is currently around 6,800 students. Lewis offers more than 80 undergraduate majors and programs of study, 22 graduate pro ...
,
North Central College North Central College is a private college in Naperville, Illinois. It is affiliated with the United Methodist Church and has nearly 70 areas of study in undergraduate majors, minors, and programs through 19 academic departments organized in thre ...
,
Elmhurst University Elmhurst University is a private university in Elmhurst, Illinois. It has a tradition of service-oriented learning and an affiliation with the United Church of Christ. The university changed its name from Elmhurst College on July 1, 2020. Hist ...
, Wheaton College,
Concordia University Concordia University ( French: ''Université Concordia'') is a public research university located in Montreal, Quebec, Canada. Founded in 1974 following the merger of Loyola College and Sir George Williams University, Concordia is one of the t ...
, and
North Park University North Park University is a private Christian university in Chicago, Illinois. It was founded in 1891 by the Evangelical Covenant Church. It is located on Chicago's north side and enrolls more than 3,000 undergraduate and graduate students. His ...
dot the Metropolitan Chicago landscape. Other institutions of higher education are found in Rockford, including
Rockford University Rockford University is a private university in Rockford, Illinois. It was founded in 1847 as Rockford Female Seminary and changed its name to Rockford College in 1892, and to Rockford University in 2013. History Rockford Female Seminary was ...
,
Rock Valley College Rock Valley College (RVC) is a Public college, public community college in Rockford, Illinois. It is part of the Illinois Community College System. RVC's district comprises Winnebago County, Illinois, Winnebago County, Boone County, Illinois, ...
, Northern Illinois University-Rockford, University of Illinois College of Medicine-Rockford, a branch of
Rasmussen College Rasmussen University is a private for-profit university with multiple locations throughout the United States. It offers associate's, bachelor's, master's and doctoral degrees at 23 campuses in Minnesota, Illinois, North Dakota, Florida, Wisconsin ...
, and a branch of
Judson University Judson University is a private Baptist university in Elgin, Illinois. It is affiliated with the American Baptist Churches USA. Judson was formed out of the liberal arts component of Northern Baptist Theological Seminary. When the seminary moved ...
. Other colleges near the Quad Cities include
Western Illinois University-Quad Cities Western Illinois University (WIU) is a public university in Macomb, Illinois. It was founded in 1899 as Western Illinois State Normal School. As the normal school grew, it became Western Illinois State Teachers College. History Western Illin ...
and Augustana College. These schools, along with several others, help to make Northern Illinois a vibrant research area. Such significant developments in science including the creation of the
Atomic Bomb A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions (thermonuclear bomb), producing a nuclear explosion. Both bomb ...
and the
Fujita Scale The Fujita scale (F-Scale; ), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation. The official Fujita scale category is determ ...
were rooted in Northern Illinois institutions.


Politics

Before Virginia, Massachusetts and Connecticut laid claims to what would become northern Illinois during colonial times. Politically, the region is quite diverse, with
Cook County Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40% of all residents of Illinois live within Cook County. As of 20 ...
and
Rock Island County Rock Island County is a county located in the U.S. state of Illinois, bounded on the west by the Mississippi River. According to the 2010 census, it had a population of 147,546. Its county seat is Rock Island; its largest city is neighboring ...
being long-time strongholds for Democrats and north-central Illinois counties ( Boone,
Ogle Ogle may refer to: Places * Ogle County, Illinois, United States * Original name of Ashton, Illinois, a village * Ogle, Kentucky, United States, an unincorporated community * Ogle Township, Somerset County, Pennsylvania, United States * Ogle, N ...
, Lee, etc.) being reliable for Republicans. Suburban Chicago counties such as DuPage, Kane, Kendall and McHenry Counties were also very reliably
Republican Republican can refer to: Political ideology * An advocate of a republic, a type of government that is not a monarchy or dictatorship, and is usually associated with the rule of law. ** Republicanism, the ideology in support of republics or agains ...
until recently. Some counties, such as
Lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
, Winnebago and
DeKalb DeKalb or De Kalb may refer to: People * Baron Johann de Kalb (1721–1780), major general in the American Revolutionary War Places Municipalities in the United States * DeKalb, Illinois, the largest city in the United States named DeKalb **DeKal ...
, were once Republican strongholds, but are now more evenly divided. Famous politicians native to the area include
Ulysses S. Grant Ulysses S. Grant (born Hiram Ulysses Grant ; April 27, 1822July 23, 1885) was an American military officer and politician who served as the 18th president of the United States from 1869 to 1877. As Commanding General, he led the Union Ar ...
,
Ronald Reagan Ronald Wilson Reagan ( ; February 6, 1911June 5, 2004) was an American politician, actor, and union leader who served as the 40th president of the United States from 1981 to 1989. He also served as the 33rd governor of California from 1967 ...
, Barack Obama,
J. Dennis Hastert John Dennis Hastert (; born January 2, 1942) is an American former politician and convicted felon who represented from 1987 to 2007 and served as the List of speakers of the United States House of Representatives, 51st speaker of the United Sta ...
,
Donald Rumsfeld Donald Henry Rumsfeld (July 9, 1932 – June 29, 2021) was an American politician, government official and businessman who served as Secretary of Defense from 1975 to 1977 under president Gerald Ford, and again from 2001 to 2006 under Presi ...
,
Hillary Clinton Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, diplomat, and former lawyer who served as the 67th United States Secretary of State for President Barack Obama from 2009 to 2013, as a United States sen ...
, and Mayors
Richard J. Daley Richard Joseph Daley (May 15, 1902 – December 20, 1976) was an American politician who served as the Mayor of Chicago from 1955 and the chairman of the Cook County Democratic Party Central Committee from 1953 until his death. He has been cal ...
and
Richard M. Daley Richard Michael Daley (born April 24, 1942) is an American politician who served as the 54th mayor of Chicago, Illinois, from 1989 to 2011. Daley was elected mayor in 1989 and was reelected five times until declining to run for a seventh term ...
.


Culture

Culturally, the area is tied heavily to Chicago. Most residents of Northern Illinois tend to support Chicago teams and lean towards the Chicago media market. The major college football program in Northern Illinois is the NIU Huskies. Northern Illinois also has large fanbases for the
Illinois Fighting Illini The Illinois Fighting Illini () are the intercollegiate athletic teams that represent the University of Illinois Urbana-Champaign. The university offers 10 men's and 11 women's varsity sports. The University operates a number of athletic faci ...
,
Notre Dame Fighting Irish The Notre Dame Fighting Irish are the athletic teams that represent the University of Notre Dame. The Fighting Irish participate in 23 National Collegiate Athletic Association (NCAA) Division I intercollegiate sports and in the NCAA's Division ...
,
Iowa Hawkeyes The Iowa Hawkeyes are the athletic teams that represent the University of Iowa, located in Iowa City, Iowa. The Hawkeyes have varsity teams in 22 sports, 8 for men and 14 for women; a 15th women's sport will be added in 2023. The teams partici ...
, and the
Northwestern Wildcats The Northwestern Wildcats are the athletic teams that represent Northwestern University, located in Evanston, Illinois. Northwestern is a founding member of the Big Ten Conference and the only private university in the conference. Northwestern ...
, as well Chicago's professional sports teams such as the Sox, the Cubs, the Bears, the Blackhawks, and the Bulls. In Central and Southern Illinois, residents are tied primarily to
St. Louis St. Louis () is the second-largest city in Missouri, United States. It sits near the confluence of the Mississippi and the Missouri Rivers. In 2020, the city proper had a population of 301,578, while the bi-state metropolitan area, which e ...
. Additionally, regional dialects in Northern Illinois vary from those in other parts of Illinois. Surprisingly, different areas in Northern Illinois have their own independent cultures. Typically, areas west of
Interstate 39 Interstate 39 (I-39) is a highway in the Midwestern United States. I-39 runs from Normal, Illinois, at I-55 to State Trunk Highway 29 (WIS 29) in the town of Rib Mountain, Wisconsin, which is approximately south of Wausau. I- ...
have more ties to Iowa and the Quad Cities area, as that is roughly the location of the westernmost terminus of the Chicago media area. Even dialects within Northern Illinois are different, emphasizing the above. Depending on location and ethnicity, a resident of the Chicago Metropolitan Area may have the stereotypical Chicago dialect, whereas those in more affluent areas, such as Lake County, may have a less easily pinpointed manner of speaking. That west of McHenry and Kane counties have more stereotypical Midwestern dialects, and might not be able to be distinguished from people in Iowa or Nebraska. Depending on how close to a specific metropolitan area a county is, their culture and media reflect that of the metro area. Areas such as the
Ottawa, IL Micropolitan Statistical Area The Ottawa, IL Micropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of three counties in north central Illinois, anchored by the city of Ottawa. Peru (until 2020) and Streator (until 2013) are form ...
have a comfortable mix of culture from the Chicago area, Quad Cities area, and Peoria, perhaps being due to its location in the center of the region.


Subregions

Northern Illinois is divisible into subregions.


Chicago metropolitan area

The
Chicago metropolitan area The Chicago metropolitan area, also colloquially referred to as Chicagoland, is a metropolitan area in the Midwestern United States. Encompassing 10,286 sq mi (28,120 km2), the metropolitan area includes the city of Chicago, its suburbs and hi ...
, or Chicagoland, is the metropolitan area associated with the city of Chicago, Illinois, and its suburbs. It is the area that is closely linked to the city through geographic, social, economic, and cultural ties.


Chicago

Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...
( or ) is the third most populous city in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
, after
New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...
and
Los Angeles Los Angeles ( ; es, Los Ángeles, link=no , ), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world' ...
. With 2.7 million residents, it is the most populous city in both the
U.S. The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States * ''Our S ...
of
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
and the
American Midwest The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of the United States. I ...
. Its metropolitan area, sometimes called ''
Chicagoland The Chicago metropolitan area, also colloquially referred to as Chicagoland, is a metropolitan area in the Midwestern United States. Encompassing 10,286 sq mi (28,120 km2), the metropolitan area includes the city of Chicago, its suburbs and hint ...
'', is home to 9.5 million people and is the third-largest in the United States. Chicago is the
seat A seat is a place to sit. The term may encompass additional features, such as back, armrest, head restraint but also headquarters in a wider sense. Types of seat The following are examples of different kinds of seat: * Armchair (furniture), ...
of
Cook County Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40% of all residents of Illinois live within Cook County. As of 20 ...
, although a small part of the city extends into
DuPage County DuPage County ( ) is a county in the U.S. state of Illinois, and one of the collar counties of the Chicago metropolitan area. As of the 2020 census, the population was 932,877, making it Illinois' second-most populous county. Its county seat is ...
.


Collar counties

The collar counties are the five counties of
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
that border on
Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...
's
Cook County Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40% of all residents of Illinois live within Cook County. As of 20 ...
. The collar counties ( DuPage, Kane,
Lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
, McHenry, and
Will Will may refer to: Common meanings * Will and testament, instructions for the disposition of one's property after death * Will (philosophy), or willpower * Will (sociology) * Will, volition (psychology) * Will, a modal verb - see Shall and will ...
) are tied to Chicago economically, but, like many
suburb A suburb (more broadly suburban area) is an area within a metropolitan area, which may include commercial and mixed-use, that is primarily a residential area. A suburb can exist either as part of a larger city/urban area or as a separate ...
an areas in the United States, have very different political leanings than does the core city. Chicago has long been a Democratic stronghold, and the collar counties are known for being historically Republican strongholds. While the demographics of these suburban Chicago counties are fairly typical for American
metropolitan area A metropolitan area or metro is a region that consists of a densely populated urban agglomeration and its surrounding territories sharing industries, commercial areas, transport network, infrastructures and housing. A metro area usually com ...
s, the term is apparently unique to this area. And because Chicago is so firmly entrenched in the Democratic column, and rural
Downstate Illinois Downstate Illinois refers to the part of the U.S. state of Illinois south of the Chicago metropolitan area, which is in the northeast corner of the state and has been dominant in American history, politics, and culture. It is defined as the part ...
is so overwhelmingly
Republican Republican can refer to: Political ideology * An advocate of a republic, a type of government that is not a monarchy or dictatorship, and is usually associated with the rule of law. ** Republicanism, the ideology in support of republics or agains ...
, the collar counties are routinely cited as being the key to any statewide election. However, that conventional wisdom was challenged by the fact that in 2010 Democrat Pat Quinn became governor while winning only Cook, St. Clair, Jackson and Alexander counties. All five collar counties went Republican, so the key to winning that gubernatorial election was simply winning Cook County, but by a wide enough margin to overwhelm the rest of the state. While the term is perhaps most often employed in political discussions, that is not its exclusive use.
Barack Obama Barack Hussein Obama II ( ; born August 4, 1961) is an American politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, Obama was the first African-American president of the U ...
used the term in his speech before the Democratic National Convention in 2004.


Fox Valley

The Fox Valley—also commonly known as the Fox River Valley—is a
suburb A suburb (more broadly suburban area) is an area within a metropolitan area, which may include commercial and mixed-use, that is primarily a residential area. A suburb can exist either as part of a larger city/urban area or as a separate ...
an and exurban region within Illinois along the western edge of the Chicago suburbs. This region centers on the Fox River of Illinois and Wisconsin. Around 1 million people live in this area. Native American tribes that lived near the Fox River included the Potawatomi, Sac, and Fox tribes. Some of cities in the Fox River Valley are part of the rust belt. Within this region is Aurora, the second largest city in the state, Elgin, and the nearby cities of Batavia, St. Charles, and Geneva, which have been known as "the Tri-City area" since the early 20th century.


Northwestern Illinois

Northwestern Illinois Northwestern Illinois is a geographic region of the state of Illinois within the USA. Northwestern Illinois is generally considered to consist of the following area: Jo Daviess County, Carroll County, Whiteside County, Stephenson County, Win ...
is generally considered to consist of the following area: Jo Daviess County, Carroll County, Whiteside County, Stephenson County, Winnebago County, Ogle County, and Lee County. Northwestern Illinois borders the states of Iowa to the west and Wisconsin to the north.


Rockford, Illinois, metropolitan area

The Rockford Metropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of four counties in north-central Illinois, anchored by the city of Rockford. As of the 2010 census, the MSA had a population of 349,431.


Quad Cities

The
Quad Cities The Quad Cities is a region of cities (originally four, see History) in the U.S. states of Iowa and Illinois: Davenport and Bettendorf in southeastern Iowa, and Rock Island, Moline and East Moline in northwestern Illinois. These cities are t ...
is a group of five cities straddling the
Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it f ...
on the
Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
boundary, in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
. These cities, Davenport and Bettendorf (in
Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...
) and Rock Island, Moline, and East Moline (in
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...
), are the center of the
Quad Cities Metropolitan Area The Quad Cities metropolitan area, more formally known as the Davenport–Moline–Rock Island Metropolitan Statistical Area, is the metropolitan area associated with the Quad Cities in the U.S. states of Iowa and Illinois. The area consists of t ...
, which, as of 2012, had a population estimate of 382,630 and a
CSA CSA may refer to: Arts and media * Canadian Screen Awards, annual awards given by the Academy of Canadian Cinema & Television * Commission on Superhuman Activities, a fictional American government agency in Marvel Comics * Crime Syndicate of Amer ...
population of 474,226, making it the 90th largest CSA in the nation. The Quad Cities is midway between Minneapolis and St. Louis, north and south, and Chicago and Des Moines, east and west. The area is the largest 300-mile market west of Chicago.


Counties

* Boone *
Bureau Bureau ( ) may refer to: Agencies and organizations * Government agency *Public administration * News bureau, an office for gathering or distributing news, generally for a given geographical location * Bureau (European Parliament), the administra ...
* Carroll *
Cook Cook or The Cook may refer to: Food preparation * Cooking, the preparation of food * Cook (domestic worker), a household staff member who prepares food * Cook (professional), an individual who prepares food for consumption in the food industry * ...
*
DeKalb DeKalb or De Kalb may refer to: People * Baron Johann de Kalb (1721–1780), major general in the American Revolutionary War Places Municipalities in the United States * DeKalb, Illinois, the largest city in the United States named DeKalb **DeKal ...
* DuPage * Grundy *
Henry Henry may refer to: People *Henry (given name) * Henry (surname) * Henry Lau, Canadian singer and musician who performs under the mononym Henry Royalty * Portuguese royalty ** King-Cardinal Henry, King of Portugal ** Henry, Count of Portugal, ...
* Jo Daviess * Kane * Kankakee * Kendall *
Lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...
* LaSalle * Lee * McHenry *
Mercer Mercer may refer to: Business * Mercer (car), a defunct American automobile manufacturer (1909–1925) * Mercer (consulting firm), a large human resources consulting firm headquartered in New York City * Mercer (occupation), a merchant or trader, ...
*
Ogle Ogle may refer to: Places * Ogle County, Illinois, United States * Original name of Ashton, Illinois, a village * Ogle, Kentucky, United States, an unincorporated community * Ogle Township, Somerset County, Pennsylvania, United States * Ogle, N ...
* Putnam * Rock Island * Stephenson *
Whiteside Whiteside may refer to: Places ;Australia * Whiteside, Queensland, suburb in the Moreton Bay Region, Queensland ;Canada * Whiteside, Nova Scotia ;United Kingdom * Whiteside (Lake District), a fell in the west of the English Lake District * White ...
*
Will Will may refer to: Common meanings * Will and testament, instructions for the disposition of one's property after death * Will (philosophy), or willpower * Will (sociology) * Will, volition (psychology) * Will, a modal verb - see Shall and will ...
* Winnebago


References

{{coord, 41, 45, N, 89, 15, W, region:US-IL_scale:1000000, display=title Regions of Illinois Chicago metropolitan area