Jefferson County, Missouri
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Jefferson County is located in the eastern portion of the U.S. state of
Missouri Missouri (''see #Etymology and pronunciation, pronunciation'') is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it border ...
. It is a part of the St. Louis Metropolitan Area. As of the 2020 census, the population was 226,739, making it the sixth-most populous county in Missouri. Its
county seat A county seat is an administrative center, seat of government, or capital city of a county or parish (administrative division), civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equiva ...
is Hillsboro. The county was organized in 1818 and named in honor of former president
Thomas Jefferson Thomas Jefferson (, 1743July 4, 1826) was an American Founding Fathers of the United States, Founding Father and the third president of the United States from 1801 to 1809. He was the primary author of the United States Declaration of Indepe ...
. In 1980, according to the U.S. census held that year, the county contained the mean center of U.S. population. Notably, this was the first census in which the center of population was west of the
Mississippi River The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
. Jefferson County is part of the St. Louis Metropolitan Statistical Area and encompasses many of the city's southern
suburb A suburb (more broadly suburban area) is an area within a metropolitan area. They are oftentimes where most of a metropolitan areas jobs are located with some being predominantly residential. They can either be denser or less densely populated ...
s.


Geography

According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.2%) is water. The county's eastern border is the
Mississippi River The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
.


Adjacent counties

* St. Louis County (north) * Monroe County, Illinois (east) * Ste. Genevieve County (southeast) * St. Francois County (south) * Washington County (southwest) * Franklin County (west)


Major highways

*
Interstate 55 Interstate 55 (I-55) is a major Interstate Highway in the central United States. As with most primary Interstates that end in a five, it is a major cross-country, north–south route, connecting the Gulf of Mexico to the Great Lakes. The ...
* U.S. Route 61 *
U.S. Route 67 U.S. Route 67 is a major north–south U.S. highway which extends for 1,560 miles (2,511 km) in the Central United States. The southern terminus of the route is at the United States-Mexico border in Presidio, Texas, where it continues ...
* Route 21 * Route 30 * Route 109 * Route 110 * Route 141 * Route 231


National protected area

* Middle Mississippi River National Wildlife Refuge (part)


Demographics

As of the 2020 census, Jefferson County had a population of 226,739. The ethnic and racial makeup of the county was 90.4% white (89.7% non-Hispanic white), 1.0% black or African American, 0.3% American Indian, 0.8% Asian, 0.8% some other race, and 6.6% two or more races. 2.4% of the population was of Hispanic or Latino origin. As of the 2010 census, Jefferson County had a population of 218,733. The reported ethnic and racial make up of the population was 95.4% non-Hispanic white, 0.8% African-American, 0.3% Native American, 0.6% Asian, 0.4% reporting some other race, 1.3% reporting two or more races and 1.6% Hispanic or Latino of any race. As of the census of 2000, there were 198,099 people, 71,499 households, and 54,553 families residing in the county. The
population density Population density (in agriculture: Standing stock (disambiguation), standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geog ...
was . There were 75,586 housing units at an average density of . The racial makeup of the county was 97.48% White, 0.68% Black or African American, 0.29% Native American, 0.36% Asian, 0.01% Pacific Islander, 0.24% from other races, and 0.93% from two or more races. Approximately 1.01% of the population were Hispanic or Latino of any race. There were 71,499 households, out of which 38.90% had children under the age of 18 living with them, 61.00% were
married couples Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...
living together, 10.40% had a female householder with no husband present, and 23.70% were non-families. 18.90% of all households were made up of individuals, and 6.10% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.12. In the county, the population was spread out, with 27.90% under the age of 18, 8.50% from 18 to 24, 31.80% from 25 to 44, 22.50% from 45 to 64, and 9.20% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.90 males. For every 100 females age 18 and over, there were 95.90 males. The median income for a household in the county was $60,636, and the median income for a family was $66,697. Males had a median income of $37,822 versus $25,440 for females. The
per capita income Per capita income (PCI) or average income measures the average income earned per person in a given area (city, region, country, etc.) in a specified year. In many countries, per capita income is determined using regular population surveys, such ...
for the county was $25,058. About 4.90% of families and 6.80% of the population were below the
poverty line The poverty threshold, poverty limit, poverty line, or breadline is the minimum level of income deemed adequate in a particular country. The poverty line is usually calculated by estimating the total cost of one year's worth of necessities for ...
, including 8.10% of those under age 18 and 6.30% of those age 65 or over. There were 146,316 registered voters in 2008. As of October 24, 2012, there were 148,011.


2020 census


Education

K-12 school districts with territory in the county, no matter how slight, include:
Text list
/ref> * Crystal City 47 School District * De Soto 73 School District * Dunklin R-V School District * Festus R-VI School District * Fox C-6 School District * Grandview R-II School District * Hillsboro R-III School District * Kingston K-14 School District * North St. Francis County R-I School District * Northwest R-I School District * Meramec Valley R-III School District * Rockwood R-VI School District * Windsor C-1 School District Additionally, there are two elementary school districts: Jefferson County R-VII School District and Sunrise R-IX School District.


Public schools

* School District 47 - Crystal City ** Crystal City High School - Crystal City *De Soto School District 73 - De Soto **Early Childhood Center (PK) **Athena Elementary School (K-06) **Vineland Elementary School (K-06) **De Soto Jr. High School (07-08) ** De Soto High School (09-12) * Dunklin R-V School District -
Herculaneum Herculaneum is an ancient Rome, ancient Roman town located in the modern-day ''comune'' of Ercolano, Campania, Italy. Herculaneum was buried under a massive pyroclastic flow in the eruption of Mount Vesuvius in 79 AD. Like the nearby city of ...
* Festus R-IV School District - Festus **Festus Elementary School (K-03) **Festus Intermediate School (04-06) **Festus Middle School (07-08) ** Festus High School (09-12) * Fox C-6 School District - Arnold * Grandview R-II School District - Hillsboro **Grandview Elementary School (K-05) - Hillsboro **Grandview Middle School (06-08) - Hillsboro ** Grandview High School (09-12) - Ware * Hillsboro R-3 School District - Hillsboro **Hillsboro Primary School (K-02) **Hillsboro Elementary School (03-04) **Hillsboro Middle School (05-06) **Hillsboro Jr. High School (07-08) ** Hillsboro High School (09-12) * Jefferson County R-VII School District - Festus **Plattin Primary School (PK-02) - Plattin **Telegraph Intermediate School (03-05) - Festus **Danby-Rush Tower Middle School (06-08) - Festus ** Jefferson High School- Festus * Northwest R-I School District - High Ridge **Brennan Woods Elementary School (K-05) - High Ridge **Cedar Springs Elementary School (K-05) - House Springs **High Ridge Elementary School (K-05) - High Ridge **House Springs Elementary School (K-05) - House Springs **Maple Grove Elementary School (K-05) - Dittmer **Murphy Elementary School (K-05) - High Ridge **Woodridge Middle School (06-08) - High Ridge **Valley Middle School (06-08) - House Springs ** Northwest High School (09-12) - Cedar Hill * Sunrise R-IX School District - De Soto **Sunrise Elementary School (K-08) - De Soto * Windsor C-1 School District - Imperial


Private schools

*Christian Outreach School (K-12) - Hillsboro - Nondenominational Christian *People's Christian Academy (K-12) - Arnold - Assembly of God/
Pentecostal Pentecostalism or classical Pentecostalism is a movement within the broader Evangelical wing of Protestantism, Protestant Christianity that emphasizes direct personal experience of God in Christianity, God through Baptism with the Holy Spirit#Cl ...
* St. Pius X High School (09-12) - Festus -
Roman Catholic The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...
* Twin City Christian Academy (PK-12) - Festus -
Baptist Baptists are a Christian denomination, denomination within Protestant Christianity distinguished by baptizing only professing Christian believers (believer's baptism) and doing so by complete Immersion baptism, immersion. Baptist churches ge ...
*Good Shepherd Catholic School - (K-08) - Hillsboro - Roman Catholic *Holy Child Elementary & Middle School - Arnold - (K-08) - Roman Catholic *Manna Christian Academy - De Soto - (K-12) -
Southern Baptist The Southern Baptist Convention (SBC), alternatively the Great Commission Baptists (GCB), is a Christian denomination based in the United States. It is the world's largest Baptist organization, the largest Protestantism in the United States, Pr ...
*Our Lady's Catholic School - Festus - (K-08) - Roman Catholic *Sacred Heart Catholic School - Festus - (K-08) - Roman Catholic *St. Anthony's Catholic School - High Ridge - (K-08) - Roman Catholic *St. Joseph's Catholic School - Imperial - (K-08) - Roman Catholic *St. Johns Lutheran School - Arnold - (PK-08) - Lutheran *St. Johns School - Imperial - (K-08) - Nondenominational Christianity *St. Rose of Lima Catholic School - De Soto - (K-08) - Roman Catholic


Postsecondary

Jefferson College - Hillsboro: A public, two-year community college


Public libraries

* Crystal City Public Library * De Soto Public Library *Festus Public Library * Herculaneum Public Library *Jefferson County Public Library


Politics


Local

Historically, the Democratic Party has controlled politics at the local level; starting in 2010 the Republican Party has flipped the county with 66% of the population voting Republican in 2020.


State

Jefferson County is divided into seven legislative districts in the Missouri House of Representatives; all of which are held by Republicans. Jefferson County consists of two State Senate Districts. *District 111 Shane Roden (R- Cedar Hill). Consists of Byrnes Mill, Cedar Hill, Cedar Hill Lakes, House Springs, and Scottsdale. *District 112 Rob Vescovo (R- Arnold). Consists of areas near Arnold and Byrnes Mill. *District 113 Dan Shaul (R- Imperial). Consists of most Arnold, all of Imperial and Kimmswick, and part of Barnhart. *District 114 Becky Ruth (R- Festus). Consists of part of Barnhart, and all of Crystal City, Festus, Herculaneum, and Pevely. *District 115 Cyndi Buchheit-Courtway (R- Festus). Consists of Olympian Village and areas near De Soto. *District 118 Mike McGirl (R- Potosi). Consists of De Soto and Hillsboro. Jefferson County is also divided into two districts in the
Missouri Senate The Missouri Senate is the upper chamber of the Missouri General Assembly. It has 34 members, representing districts with an average population of 181,000. Its members serve four-year terms, with half the seats being up for election every two yea ...
. *District 3 — Elaine Gannon (R- De Soto) Consists of De Soto, Hillsboro, and Olympian Village as well as part of Festus. *District 22 — Paul Wieland (R- Imperial) Consists of the northern part of the county.


Federal

Jefferson County is divided among three congressional districts. Prior to the 2012 election all of it was included in Missouri's 3rd Congressional District, but now about half of it is in the 3rd District, while the northeastern portion is in the 2nd Congressional District and the southern portion is in the 8th Congressional District.


Political culture

A predominantly
suburb A suburb (more broadly suburban area) is an area within a metropolitan area. They are oftentimes where most of a metropolitan areas jobs are located with some being predominantly residential. They can either be denser or less densely populated ...
an county, Jefferson County used to be fairly independent-leaning at the federal level with a tendency to tilt Democratic. Presidential elections in Jefferson County were often very close;
George W. Bush George Walker Bush (born July 6, 1946) is an American politician and businessman who was the 43rd president of the United States from 2001 to 2009. A member of the Bush family and the Republican Party (United States), Republican Party, he i ...
just narrowly carried the county in
2004 2004 was designated as an International Year of Rice by the United Nations, and the International Year to Commemorate the Struggle Against Slavery and Its Abolition (by UNESCO). Events January * January 3 – Flash Airlines Flight 60 ...
by less than 600 votes and by just over a half of a percentage point.
Al Gore Albert Arnold Gore Jr. (born March 31, 1948) is an American former politician, businessman, and environmentalist who served as the 45th vice president of the United States from 1993 to 2001 under President Bill Clinton. He previously served as ...
and
Barack Obama Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
also just narrowly carried the county in 2000 and 2008, respectively.
Bill Clinton William Jefferson Clinton (né Blythe III; born August 19, 1946) is an American politician and lawyer who was the 42nd president of the United States from 1993 to 2001. A member of the Democratic Party (United States), Democratic Party, ...
, however, did manage to carry Jefferson County by double digits both times in 1992 and 1996. However, in 2012 the county, in line with the state as a whole, began to swing hard to the right with
Mitt Romney Willard Mitt Romney (born March 12, 1947) is an American businessman and retired politician. He served as a United States Senate, United States senator from Utah from 2019 to 2025 and as the 70th governor of Massachusetts from 2003 to 2007 ...
carrying it with 55% of the vote. In 2016
Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...
won the county with 65% of the vote, the largest margin of any candidate since
Lyndon Johnson Lyndon Baines Johnson (; August 27, 1908January 22, 1973), also known as LBJ, was the 36th president of the United States, serving from 1963 to 1969. He became president after assassination of John F. Kennedy, the assassination of John F. Ken ...
in 1964. Typical of the suburban culture in most counties throughout the country, voters in Jefferson County tend to be rather centrist on social issues but more liberal on economic issues. In 2004, Missourians voted on a constitutional amendment to define marriage as the union between a man and a woman—it overwhelmingly passed Jefferson County with 72.56 percent of the vote. The initiative passed the state with 71 percent of support from voters as Missouri became the first state to ban
same-sex marriage Same-sex marriage, also known as gay marriage, is the marriage of two people of the same legal Legal sex and gender, sex. marriage between same-sex couples is legally performed and recognized in 38 countries, with a total population of 1.5 ...
. In 2006, Missourians voted on a constitutional amendment to fund and legalize embryonic stem cell research in the state—it narrowly passed Jefferson County with 51.85 percent voting for the measure. The initiative narrowly passed the state with 51 percent of support from voters as Missouri became one of the first states in the nation to approve embryonic stem cell research. In 2006, Missourians voted on a proposition (Proposition B) to increase the
minimum wage A minimum wage is the lowest remuneration that employers can legally pay their employees—the price floor below which employees may not sell their labor. List of countries by minimum wage, Most countries had introduced minimum wage legislation b ...
in the state to $6.50 an hour—it passed Jefferson County with 79.90 percent of the vote. The proposition strongly passed every single county in Missouri with 78.99 percent voting in favor as the minimum wage was increased to $6.50 an hour in the state. During the same election, voters in five other states also strongly approved increases in the minimum wage.


2008 Missouri presidential primary

;Republican U.S. Senator
John McCain John Sidney McCain III (August 29, 1936 – August 25, 2018) was an American statesman and United States Navy, naval officer who represented the Arizona, state of Arizona in United States Congress, Congress for over 35 years, first as ...
(R-
Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...
) won Jefferson County with 33.54% of the vote. Former
Governor A governor is an politician, administrative leader and head of a polity or Region#Political regions, political region, in some cases, such as governor-general, governors-general, as the head of a state's official representative. Depending on the ...
Mitt Romney Willard Mitt Romney (born March 12, 1947) is an American businessman and retired politician. He served as a United States Senate, United States senator from Utah from 2019 to 2025 and as the 70th governor of Massachusetts from 2003 to 2007 ...
(R-
Massachusetts Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...
finished in second with 30.45% of the vote, while former
Governor A governor is an politician, administrative leader and head of a polity or Region#Political regions, political region, in some cases, such as governor-general, governors-general, as the head of a state's official representative. Depending on the ...
Mike Huckabee (R-
Arkansas Arkansas ( ) is a landlocked state in the West South Central region of the Southern United States. It borders Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, Texas to the southwest, and Oklahoma ...
) came in third with 30.19% in Jefferson County. Libertarian-leaning U.S. Representative
Ron Paul Ronald Ernest Paul (born August 20, 1935) is an American author, activist, and politician who served as the U.S. representative for Texas's 22nd congressional district from 1976 to 1977, and again from 1979 to 1985, as well as for Texas' ...
(R-
Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...
) finished a distant fourth place with 3.94% of the vote in Jefferson County. McCain received all of Missouri's 58 delegates as the Republican Party utilizes the winner-takes-all system. ;Democratic U.S. Senator
Hillary Clinton Hillary Diane Rodham Clinton ( Rodham; born October 26, 1947) is an American politician, lawyer and diplomat. She was the 67th United States secretary of state in the administration of Barack Obama from 2009 to 2013, a U.S. senator represent ...
(D- New York) won Jefferson County over Senator
Barack Obama Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...
(D-
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. It borders on Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash River, Wabash and Ohio River, Ohio rivers to its ...
) with 61.32% of the vote, while Obama received 35.02% of the vote. Although he withdrew from the race, former U.S. Senator John Edwards (D-
North Carolina North Carolina ( ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It is bordered by Virginia to the north, the Atlantic Ocean to the east, South Carolina to the south, Georgia (U.S. stat ...
) still received 2.74% of the vote in Jefferson County. Jefferson County gave Clinton one of her strongest showings in a predominantly suburban county in the entire country. Clinton had a large initial lead in Missouri at the beginning of the evening as the rural precincts began to report, leading several news organizations to call the state for her; however, Obama rallied from behind as the heavily
African American African Americans, also known as Black Americans and formerly also called Afro-Americans, are an Race and ethnicity in the United States, American racial and ethnic group that consists of Americans who have total or partial ancestry from an ...
precincts from St. Louis began to report and eventually put him over the top. In the end, Obama received 49.32 percent of the vote to Clinton's 47.90% — a 1.42% difference. Both candidates split Missouri's 72 delegates, as the Democratic Party utilizes
proportional representation Proportional representation (PR) refers to any electoral system under which subgroups of an electorate are reflected proportionately in the elected body. The concept applies mainly to political divisions (Political party, political parties) amon ...
. Hillary Rodham Clinton received more votes, a total of 19,075, than any candidate from either party in Jefferson County during the 2008 Missouri Presidential Primaries. She also received more votes than the total number of votes cast in the entire Republican Primary in Jefferson County.


Health

According to a 2012 census study by the University of Wisconsin Population Health Institute and the Robert Wood Johnson Foundation, Jefferson County led the Saint Louis metropolitan area in the number of adults who smoke, roughly 30% of all adult residents of Jefferson County smoked or used tobacco in some form, compared to the 19% national average and the 24% Missouri state average. Jefferson County and the state of Missouri led the nation in
methamphetamine Methamphetamine (contracted from ) is a potent central nervous system (CNS) stimulant that is mainly used as a recreational drug use, recreational or Performance-enhancing substance, performance-enhancing drug and less commonly as a secon ...
production, peaking in the mid-2000s.


Jefferson County Parks and Recreation


Communities


Cities

* Arnold * Byrnes Mill * Crystal City * De Soto * Eureka (Mostly in St.Louis County) * Festus *
Herculaneum Herculaneum is an ancient Rome, ancient Roman town located in the modern-day ''comune'' of Ercolano, Campania, Italy. Herculaneum was buried under a massive pyroclastic flow in the eruption of Mount Vesuvius in 79 AD. Like the nearby city of ...
* Hillsboro (county seat) * Kimmswick * Olympian Village * Pevely


Villages

* Cedar Hill Lakes * Lake Tekakwitha * Parkdale * Peaceful Village * Scotsdale


Townships

* Big River * Central * High Ridge *
Joachim Joachim was, according to Sacred tradition, the husband of Saint Anne, the father of Mary, mother of Jesus, Mary (mother of Jesus), and the maternal grandfather of Jesus. The story of Joachim and Anne first appears in the Gospel of James, part of ...
* Meramec * Plattin * Rock * Valle


Census-designated places

* Barnhart * Briarwood Estates * Cedar Hill * High Ridge * Horine * Imperial * LaBarque Creek * Murphy * Raintree Plantation * Summer Set


Other unincorporated communities

* Antonia * Bailey * Belews Creek * Bushburg * Byrnesville * Danby * Dittmer * Donnell * Fletcher * Flucom * Frumet * Goldman * Grubville *
Hematite Hematite (), also spelled as haematite, is a common iron oxide compound with the formula, Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of . ...
* House Springs * Jarvis * Knorpp * Liguori *
Local Local may refer to: Geography and transportation * Local (train), a train serving local traffic demand * Local, Missouri, a community in the United States Arts, entertainment, and media * ''Local'' (comics), a limited series comic book by Bria ...
* Ludwig * Mapaville * Melzo * Meramec Heights * Morse Mill * Munsons * Oermann * Old Mines * Papin * Plattin * Regina * Riverside * Rush Tower * Seckman * Selma * Sulphur Springs * Valles Mines * Victoria * Vineland * Ware


See also

*
List of counties in Missouri There are 114 counties and one independent city in the U.S. State of Missouri. Following the Louisiana Purchase and the admittance of Louisiana into the United States in 1812, five counties were formed out of the Missouri Territory at the ...
* National Register of Historic Places listings in Jefferson County, Missouri * Matthew "Mack" Harrison Marsden


References


External links


Digitized 1930 Plat Book of Jefferson County
from
University of Missouri The University of Missouri (Mizzou or MU) is a public university, public Land-grant university, land-grant research university in Columbia, Missouri, United States. It is Missouri's largest university and the flagship of the four-campus Univers ...
Division of Special Collections, Archives, and Rare Books
Jefferson County Heritage and Historical Society
of Missouri

* https://www.sos.mo.gov/CMSImages/Publications/2021-2022_MO_Roster.pdf {{authority control Missouri counties 1818 establishments in Missouri Territory Missouri counties on the Mississippi River Populated places established in 1818 Regions of Greater St. Louis