Arapahoe County ( ) is a

county A county is a geographic region of a country used for administrative or other purposes Chambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...

located in 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 sove ...

Colorado Colorado (, other variants) is a state in the Mountain states, Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the wes ...

. As of the 2020 census, its population was 655,070, making it the third-most populous county in Colorado. The

county seat A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is in use in Canada, China, Hungary, Romania, Taiwan, and the United States. The equivalent term shire town is used in the US st ...

is Littleton, and the most populous city is

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 ...

. The county was named for the

Arapaho The Arapaho (; french: Arapahos, ) are a Native American people historically living on the plains of Colorado and Wyoming. They were close allies of the Cheyenne tribe and loosely aligned with the Lakota and Dakota. By the 1850s, Arapaho ba ...

Native American tribe, who once lived in the region. Arapahoe County is part of the

Denver Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

-Aurora- Lakewood

metropolitan statistical area In the United States, a metropolitan statistical area (MSA) is a geographical region with a relatively high population density at its core and close economic ties throughout the area. Such regions are neither legally incorporated as a city or tow ...

. Arapahoe County calls itself "Colorado's First County", since its origins antedate the

Pike's Peak Gold Rush The Pike's Peak Gold Rush (later known as the Colorado Gold Rush) was the boom in gold prospecting and mining in the Pike's Peak Country of western Kansas Territory and southwestern Nebraska Territory of the United States that began in July 1858 ...

History

On August 25, 1855, the

Kansas Territorial Legislature The Kansas Legislature is the state legislature of the U.S. state of Kansas. It is a bicameral assembly, composed of the lower Kansas House of Representatives, with 125 state representatives, and the upper Kansas Senate, with 40 state senators ...

created a huge Arapahoe County to govern the entire western portion of the

Territory of Kansas The Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the free state of Kansas. ...

. The county was named for the

Arapaho Nation The Arapaho (; french: Arapahos, ) are a Native American people historically living on the plains of Colorado and Wyoming. They were close allies of the Cheyenne tribe and loosely aligned with the Lakota and Dakota. By the 1850s, Arapaho ban ...

, who lived in the region. In July 1858, gold was discovered along the

South Platte River The South Platte River is one of the two principal tributaries of the Platte River. Flowing through the U.S. states of Colorado and Nebraska, it is itself a major river of the American Midwest and the American Southwest/ Mountain West. It ...

in Arapahoe County (in present-day Englewood). This discovery precipitated the Pike's Peak Gold Rush. Many residents of the mining region felt disconnected from the remote territorial governments of

Kansas Kansas () is a state in the Midwestern United States. Its capital is Topeka, and its largest city is Wichita. Kansas is a landlocked state bordered by Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to th ...

and

Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the sout ...

, so they voted to form their own

Territory of Jefferson The Territory of Jefferson was an extralegal and unrecognized United States territory that existed from October 24, 1859 until the creation of the Colorado Territory on February 28, 1861. The Jefferson Territory, named for Founding Father and Un ...

on October 24, 1859. The following month, the Jefferson Territorial Legislature organized 12 counties for the new territory, including a smaller Arapahoe County. Denver City served as the

of Arapahoe County. The Jefferson Territory never received federal sanction, and when the State of Kansas was admitted to the Union on January 29, 1861, the mining regions temporarily reverted to unorganized territory. On February 28, 1861, Congress passed an act organizing the

Territory of Colorado The Territory of Colorado was an organized incorporated territory of the United States that existed from February 28, 1861, until August 1, 1876, when it was admitted to the Union as the State of Colorado. The territory was organized in the ...

, using present-day borders. On November 1, 1861, the Colorado Territorial Assembly organized the 17 original counties of Colorado, including a new Arapahoe County. Arapahoe County originally stretched from the line of present-day Sheridan Boulevard 160 miles (258 km) east to the Kansas border, and from the line of present-day County Line Road 30 miles (48 km) north to the

40th parallel north The 40th parallel north is a circle of latitude that is 40 degrees north of the Earth's equatorial plane. It crosses Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean. At this latitude the sun is vi ...

(168th Avenue). Denver City served as the

of Arapahoe County until 1902. In 1901, the

Colorado General Assembly The Colorado General Assembly is the state legislature of the State of Colorado. It is a bicameral legislature that was created by the 1876 state constitution. Its statutes are codified in the ''Colorado Revised Statutes'' (C.R.S.). The se ...

voted to split Arapahoe County into three parts - a new consolidated City and County of Denver, a new Adams County, and the remainder of the Arapahoe County to be renamed South Arapahoe County. A ruling by the

Colorado Supreme Court The Colorado Supreme Court is the highest court in the U.S. state of Colorado. Located in Denver, the Court consists of a Chief Justice and six Associate Justices. Powers and duties Appellate jurisdiction Discretionary appeals The Court ...

, subsequent

legislation Legislation is the process or result of enrolling, enacting, or promulgating laws by a legislature, parliament, or analogous governing body. Before an item of legislation becomes law it may be known as a bill, and may be broadly referred to ...

, and a

referendum A referendum (plural: referendums or less commonly referenda) is a direct vote by the electorate on a proposal, law, or political issue. This is in contrast to an issue being voted on by a representative. This may result in the adoption of a ...

delayed the reorganization until November 15, 1902.

Governor A governor is an administrative leader and head of a polity or political region, ranking under the head of state and in some cases, such as governors-general, as the head of state's official representative. Depending on the type of political ...

James Bradley Orman designated Littleton as the temporary

of South Arapahoe County. On April 11, 1903, the

changed the name of South Arapahoe County back to Arapahoe County. On November 8, 1904, Arapahoe County voters chose Littleton over Englewood by a vote of 1310 to 829 to be the permanent county seat.

Geography

According to the U.S. Census Bureau, the county has a total area of , of which are land and (0.9%) are covered by water. The county measures 72 mi (116 km) east-west and 4 to 12 mi (6 to 19 km) north-south. Two exclaves of Arapahoe County are entirely surrounded by the City and County of Denver, the City of Glendale, and the Holly Hills neighborhood, a

census-designated place A census-designated place (CDP) is a Place (United States Census Bureau), concentration of population defined by the United States Census Bureau for statistical purposes only. CDPs have been used in each decennial census since 1980 as the count ...

Adjacent counties

* City and County of Denver – northwest and exclaves * Adams County – north * Washington County – east * Lincoln County – southeast *

Elbert County Elbert County is the name of two counties in the United States: * Elbert County, Colorado * Elbert County, Georgia {{Geodis, uscounty ...

– south * Douglas County – southwest * Jefferson County – west

Major highways

Interstate 25 * I-70 (CO)

Interstate 70 Interstate 70 (I-70) is a major east–west Interstate Highway in the United States that runs from I-15 near Cove Fort, Utah, to a park and ride lot just east of I-695 in Baltimore, Maryland, and is the fifth-longest Interstate in the co ...

Interstate 225 Interstate 225 (I-225) is an auxiliary Interstate Highway in the U.S. state of Colorado. The freeway is a connector spur route of I-25 that acts as an eastern bypass in the Denver metropolitan area and serves Aurora. It also provides direct ...

* * * * *

U.S. Highway 85 U.S. Route 85 (US 85) is a north–south United States Highway that travels in the Mountain and Northern Plains states of the United States. The southern terminus of the highway is at the Mexican border in El Paso, Texas, connecting wi ...

U.S. Highway 285 * Colorado 30

State Highway 30 * Colorado 36

State Highway 36 * Colorado 40

State Highway 40 * Colorado 75

State Highway 75 * Colorado 79

State Highway 79 * Colorado 83

State Highway 83 * Colorado 88

State Highway 88 * Colorado 177

State Highway 177 * Colorado 470

State Highway 470 * E-470 (tollway)

State park

* Cherry Creek State Park

Historic trails

Smoky Hill Trail The Smoky Hill Trail was an American trail across the central Great Plains of North America in use from 1855 to 1870. Established in what was then Kansas Territory, it extended west from Atchison, Kansas on the Missouri River to Denver, spanning ...

* South Platte Trail

Recreation trails

Highline Canal National Recreation Trail The High Line Canal (HLC) is a man-made waterway, used for irrigation and recreation, that serves the Denver-Aurora metropolitan area. It begins at a diversion dam on the South Platte River, some above the mouth of Waterton Canyon. From its headg ...

* Platte River Greenway National Recreation Trail

Demographics

As of the

census A census is the procedure of systematically acquiring, recording and calculating information about the members of a given population. This term is used mostly in connection with national population and housing censuses; other common censuses in ...

of 2000, 487,967 people, 190,909 households, and 125,809 families were residing in the county. The

population density Population density (in agriculture: 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 geographical ...

was 608 people/sq mi (235/km²). The 196,835 housing units averaged 245/sq mi (95/km²). The

racial makeup A race is a categorization of humans based on shared physical or social qualities into groups generally viewed as distinct within a given society. The term came into common usage during the 1500s, when it was used to refer to groups of variou ...

of the county was 79.93% White, 7.67% African American, 0.66% Native American, 3.95% Asian, 0.12% Pacific Islander, 4.51% from other races, and 3.16% from two or more races. Hispanics or Latinos of any race made up 11.81% of the population . Of the 190,909 households, 34.90% had children under the age of 18 living with them, 51.20% were married couples living together, 10.60% had a female householder with no husband present, and 34.10% were not families. About 27.00% of all households were made up of individuals, and 5.90% had someone living alone who was 65 years of age or older. The average household size was 2.53, and the average family size was 3.11. In the county, the age distribution was 26.70% under 18, 8.60% from 18 to 24, 33.10% from 25 to 44, 23.00% from 45 to 64, and 8.60% who were 65 or older. The median age was 34 years. For every 100 females, there were 97.10 males. For every 100 females age 18 and over, there were 94.20 males. The median income for a household was $53,570, and for a family was $63,875. Males had a median income of $41,601 versus $31,612 for females. The

per capita income Per capita income (PCI) or total income measures the average income earned per person in a given area (city, region, country, etc.) in a specified year. It is calculated by dividing the area's total income by its total population. Per capita i ...

for the county was $28,147. About 4.20% of families and 5.80% 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 t ...

, including 7.00% of those under age 18 and 5.10% of those age 65 or over.

Politics

Arapahoe County was once a

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 ...

stronghold, and a classic bastion of suburban conservatism, although with a noticeable north–south split, with the working class Democratic-leaning city of

in the northwest and the former wealthy Republican strongholds in the Denver Technological Center region in the southwest, though with some Democratic strength in older, more urbanized and mixed-development suburbs bordering Denver's southwest border near Hampden Avenue such as Englewood and Sheridan (the eastern parts of the county are extremely rural and Republican to this day). However, heavy urbanization, demographic changes and population increases - such as the rapid diversification of Aurora's population and younger professionals in the southern suburbs - have caused the county to become much more competitive since the 1990s, eventually changing it to more of a Democratic-leaning suburban swing county. In 2008, the county swung over dramatically to support

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 ...

, who became the first

Democrat Democrat, Democrats, or Democratic may refer to: Politics *A proponent of democracy, or democratic government; a form of government involving rule by the people. *A member of a Democratic Party: **Democratic Party (United States) (D) **Democratic ...

to carry it since 1964, and only the second since 1936. It swung from a four-point win for

George W. Bush George Walker Bush (born July 6, 1946) is an American politician who served as the 43rd president of the United States from 2001 to 2009. A member of the Republican Party, Bush family, and son of the 41st president George H. W. Bush, he ...

in 2004 to a 13-point win for Obama in 2008. It voted for Obama by a similar margin in 2012, and provided much of

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 ...

's statewide margin in 2016 as

Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who served as the 45th president of the United States from 2017 to 2021. Trump graduated from the Wharton School of the University of P ...

failed to win even 40 percent of the vote in one of the worst showings for a Republican in the county's history, with the Democrats carrying the former Tech Center area Republican strongholds of

Centennial {{other uses, Centennial (disambiguation), Centenary (disambiguation) A centennial, or centenary in British English, is a 100th anniversary or otherwise relates to a century, a period of 100 years. Notable events Notable centennial events at ...

and Littleton. In the 2020 election, Joe Biden became the first

to carry the county with over 60% of the vote since 1916, winning both Aurora by lopsided margins and the southern parts of the county by nearly 20 points.

Communities

Cities

(most; also extends into Adams County and Douglas County) *

Cherry Hills Village The City of Cherry Hills Village is a home rule municipality located in Arapahoe County, Colorado, United States. The city population was 6,442 at the 2020 United States Census. Cherry Hills Village is a part of the Denver–Aurora–Lakewood, C ...

* Englewood * Glendale * Greenwood Village * Littleton (most; also extends into Douglas County and Jefferson County) * Sheridan

Towns

* Bennett * Bow Mar (part; also extends into Jefferson County) * Columbine Valley *

Deer Trail The Town of Deer Trail is a Statutory Town located in eastern Arapahoe County, Colorado, United States. The town population was 1,068 at the 2020 United States Census, a +95.60% increase since the 2010 United States Census. Deer Trail is a part ...

* Foxfield

Census-designated places

* Aetna Estates * Brick Center * Byers * Cherry Creek * Columbine * Comanche Creek * Dove Valley * Four Square Mile * Holly Hills * Inverness * Peoria * Strasburg * Watkins

Former census-designated places

* Castlewood (now part of Centennial) * Southglenn (now part of Centennial)

References

External links

*
Colorado County Evolution by Don StanwyckColorado Historical Society
{{authority control Colorado counties Colorado placenames of Native American origin 1861 establishments in Colorado Territory Eastern Plains Populated places established in 1861