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County | FIPS code | County seat | Established | Formed from | Etymolgy | Population | Area | Map | |
---|---|---|---|---|---|---|---|---|---|
Adams County | 001 | Brighton | 1902-11-15 | Split fromArapahoe County. | Named in honor ofAlva Adams, the 5th, 10th, and 14thGovernorof the State of Colorado. | 441,603 | 1,182.29sqmi (3,062km) | ||
Alamosa County | 003 | Alamosa | 1913-03-08 | Split fromCostilla CountyandConejos Countycounties. | Named for thecottonwood treeswhich grow along theRio Grandeand its tributaries.Alamosais a Spanish word for acottonwood grove. | 15,445 | 723.21sqmi (1,873km) | ||
Arapahoe County | 005 | Littleton | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. Renamed South Arapahoe County for the five months from November 15, 1902 to April 11, 1903. | Named for predecessorArapahoe County, Kansas Territory, which in turn was named for theArapaho NationofNative Americans. | 572,003 | 804.41sqmi (2,083km) | ||
Archuleta County | 007 | Pagosa Springs | 1885-04-14 | Split fromConejos County. | Named in honor ofColorado State SenatorAntonio D. Archuleta. | 12,084 | 1,354.53sqmi (3,508km) | ||
Baca County | 009 | 1889-04-16 | Split fromLas Animas County. | Named in honor of pioneer andColorado territorial legislatorFelipe Baca. | 3,788 | 2,558.48sqmi (6,626km) | |||
Bent County | 011 | Las Animas | 1870-02-11 | Split fromHuerfano Countyand former Cheyenne and Arapaho tribal land. | Named in honor of frontier traderWilliam Bent. | 6,499 | 1,541.07sqmi (3,991km) | ||
Boulder County | 013 | Boulder | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named for the abundance ofgranitebouldersalongBoulder Creek. | 294,567 | 740.48sqmi (1,918km) | ||
City and County of Broomfield | 014 | Broomfield | 2001-11-15 | Named for thebroom cornthat was formerly grown in the area. | 55,889 | 33.57sqmi (87km) | |||
Chaffee County | 015 | Salida | 1879-02-10 | Split fromCarbonate County. | Named in honor ofJerome Bunty Chaffee, one ofColorado's first twoU.S. Senatorsfrom 1876 to 1879. | 17,809 | 1,014.12sqmi (2,627km) | ||
Cheyenne County | 017 | Cheyenne Wells | 1889-03-25 | Split fromElbertandBentcounties. | Named for theCheyenne NationofNative Americans. | 1,836 | 1,781.90sqmi (4,615km) | ||
Clear Creek County | 019 | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named forClear Creekwhich originates in the county. | 9,088 | 396.53sqmi (1,027km) | |||
Conejos County | 021 | Conejos | 1861-11-01 | Guadalupe County, one of the 17 original counties of theTerritory of Colorado, was renamedConejos Countyafter six days on November 7, 1861. | Named for thecottontail rabbitsin the area.Conejosis a Spanish word forrabbits. | 8,256 | 1,290.22sqmi (3,342km) | ||
Costilla County | 023 | San Luis | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named for the Costilla River.Costillais a Spanish word meaning eitherlittle riborfurring timber. | 3,524 | 1,229.38sqmi (3,184km) | ||
Crowley County | 025 | Ordway | 1911-05-29 | Split fromOtero County. | Named in honor ofColorado State SenatorJohn H. Crowley. | 5,823 | 800.27sqmi (2,073km) | ||
Custer County | 027 | Westcliffe | 1877-03-09 | Split fromFremont County. | Named in memory ofGeorge Armstrong Custer, (1839 - 1876), the U.S. Armycoloneldefeated and killed at theBattle of the Little Bighorn. | 4,255 | 739.24sqmi (1,915km) | ||
Delta County | 029 | 1883-02-11 | Split fromGunnison County. | 30,952 | 1,149.44sqmi (2,977km) | ||||
City and County of Denver | 031 | Denver | 1902-11-15 | The originalArapahoeCounty Seatwas split fromArapahoe Countyand reorganized as aconsolidated city and county. | Named to curry favor withJames W. Denver,Governorof theTerritory of Kansasfrom 1857 to 1859. | 600,158 | 155.66sqmi (403km) | ||
Dolores County | 033 | Dove Creek | 1881-03-04 | Split fromOuray County. | Named for theDolores River, which was originally namedel Rio de Nuestra Senora de los Dolores, which is Spanish forthe River of our Lady of Sorrows. | 2,064 | 1,076.93sqmi (2,789km) | ||
Douglas County | 035 | Castle Rock | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named in honor ofStephen Arnold Douglas, (1813 - 1861),U.S. SenatorfromIllinoisfrom 1847 to 1861. | 285,465 | 842.30sqmi (2,182km) | ||
Eagle County | 037 | 1883-02-11 | Split fromSummit County. | Named for theEagle Riverwhich originates in the county. | 52,197 | 1,700.76sqmi (4,405km) | |||
El Paso County | 041 | Colorado Springs | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named forUte Passin the county.El pasois a Spanish expression forthe pass. | 622,263 | 2,128.60sqmi (5,513km) | ||
Elbert County | 039 | Kiowa | 1874-02-02 | Split fromDouglas County. | Named in honor ofSamuel Hitt Elbert, the sixthGovernorof theTerritory of Colorado. | 23,086 | 1,849.08sqmi (4,789km) | ||
Fremont County | 043 | Cañon City | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named in honor ofJohn Charles Frémont(1813 - 1890), the explorer, U.S. Army general, andU.S. SenatorfromCalifornia. | 46,824 | 1,533.09sqmi (3,971km) | ||
Garfield County | 045 | Glenwood Springs | 1883-02-10 | Split fromSummit County. | Named in honor ofJames Abram Garfield(1831 - 1881), the twentiethPresident of the United States. | 56,389 | 2,958.23sqmi (7,662km) | ||
Gilpin County | 047 | Central City | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named in honor ofWilliam Gilpin, the firstGovernorof theTerritory of Colorado. | 5,441 | 150.15sqmi (389km) | ||
Grand County | 049 | Hot Sulphur Springs | 1874-02-02 | Split fromSummit County. | Named for theGrand Riverwhich originates in the county. The Grand River was renamed theColorado Riverin 1921, but the county retains the original name. | 14,843 | 1,868.53sqmi (4,839km) | ||
Gunnison County | 051 | Gunnison | 1877-03-09 | Split fromLake County. | Named in honor ofJohn Williams Gunnison, the U.S. Army captain who explored the region. | 15,324 | 3,259.22sqmi (8,441km) | ||
Hinsdale County | 053 | 1874-02-10 | Split fromLake,Conejos, andCostillacounties. | Named in honor of George Aaron Hinsdale, a Lieutenant Governor of theTerritory of Colorado. | 843 | 1,123.35sqmi (2,909km) | |||
Huerfano County | 055 | Walsenburg | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named forHuerfano Butte, a solitary volcanic plug.Huerfanois a Spanish word meaningorphan. | 6,711 | 1,592.37sqmi (4,124km) | ||
Jackson County | 057 | 1909-05-05 | Split fromLarimer County. | Named in honor ofAndrew Jackson(1767 - 1845), the seventhPresident of the United States. | 1,394 | 1,619.75sqmi (4,195km) | |||
Jefferson County | 059 | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named for its extralegal predecessor county,Jefferson County, Jefferson Territory, which in turn was named in honor ofThomas Jefferson(1743 - 1826), the author of theDeclaration of Independenceand the thirdPresident of the United States. | 534,543 | 772.85sqmi (2,002km) | |||
Kiowa County | 061 | 1889-04-11 | Split fromBent County. | Named for theKiowa NationofNative Americans. | 1,398 | 1,785.90sqmi (4,625km) | |||
Kit Carson County | 063 | Burlington | 1889-04-11 | Split fromElbert County. | Named in honor ofChristopher Houston "Kit" Carson, the famous frontier scout and soldier. | 8,270 | 2,162.43sqmi (5,601km) | ||
La Plata County | 067 | Durango | 1874-02-10 | Split fromLakeandConejoscounties. | Named for the manysilverdeposits in the area.La platais a Spanish expression forthe silver. | 51,334 | 1,700.44sqmi (4,404km) | ||
Lake County | 065 | Leadville | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. RenamedCarbonate Countyfor the two days from February 8–10, 1879. | Named for theTwin Lakesin the county. | 7,310 | 383.55sqmi (993km) | ||
Larimer County | 069 | Fort Collins | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named in honor ofWilliam Larimer, a pioneer entrepreneur. | 299,630 | 2,631.75sqmi (6,816km) | ||
Las Animas County | 071 | Trinidad | 1866-02-09 | Split fromHuerfano County. | Named for theAnimas River, which was originally namedel Rio de las Animas Perdidas, which is Spanish forthe River of the Souls in Purgatory. | 15,507 | 4,773.27sqmi (12,363km) | ||
Lincoln County | 073 | Hugo | 1889-04-11 | Split fromElbertandBentcounties. | Named in honor ofAbraham Lincoln(1809 - 1865), the sixteenthPresident of the United States. | 5,467 | 2,585.21sqmi (6,696km) | ||
Logan County | 075 | 1887-02-25 | Split fromWeld County. | Named in honor ofJohn Alexander Logan(1826 - 1886), a U.S. Army general andU.S. SenatorfromIllinois. | 22,709 | 1,845.31sqmi (4,779km) | |||
Mesa County | 077 | Grand Junction | 1883-02-14 | Split fromGunnison County. | Named for themesaformations which are widespread through the area. | 146,723 | 3,345.69sqmi (8,665km) | ||
Mineral County | 079 | Creede | 1893-03-27 | Split fromHinsdale,Rio Grande, andSaguachecounties. | Named from the plentifulmineraldeposits found in the area. | 712 | 878.16sqmi (2,274km) | ||
Moffat County | 081 | 1911-02-27 | Split fromRoutt County. | Named in honor of railroad pioneerDavid H. Moffat. | 13,795 | 4,755.86sqmi (12,318km) | |||
Montezuma County | 083 | Cortez | 1889-04-16 | Split fromLa Plata County. | Named in honor ofAztecleaderMoctezuma II. Ruins in the area were once thought to be Aztec. | 25,535 | 2,035.80sqmi (5,273km) | ||
Montrose County | 085 | Montrose | 1883-02-11 | Split fromGunnison County. | Named for the town ofMontrose, which in turn was probably named from the novelA Legend of Montrose, published in 1819 byWalter Scott. | 41,276 | 2,246.43sqmi (5,818km) | ||
Morgan County | 087 | Fort Morgan | 1889-02-19 | Split fromWeld County. | Named for oldFort Morgan, which in turn was named in honor of U.S. Army ColonelChristopher A. Morgan. | 28,159 | 1,293.83sqmi (3,351km) | ||
Otero County | 089 | La Junta | 1889-03-25 | Split fromBent County. | Named in honor ofMiguel A. Oteroof the prominent Otero family of theSouthwest. | 18,831 | 1,267.66sqmi (3,283km) | ||
Ouray County | 091 | Ouray | 1877-01-18 | Split fromHinsdaleandLakecounties. RenamedUncompaghre Countyfor four days from 1883-02-27, to 1883-03-02. | Named in honor ofOuray, aUteNative Americanleader. | 4,436 | 542.30sqmi (1,405km) | ||
Park County | 093 | Fairplay | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named forSouth Parkwhich occupies most of the county. | 16,206 | 2,209.36sqmi (5,722km) | ||
Phillips County | 095 | Holyoke | 1889-03-27 | Split fromLogan County. | Named in honor of R.O. Phillips, secretary of the Lincoln Land Company, which sold farmsteads in the area. | 4,442 | 688.30sqmi (1,783km) | ||
Pitkin County | 097 | 1881-02-23 | Split fromGunnison County. | Named in honor ofFrederick Walker Pitkin, the secondGovernorof the State of Colorado. | 17,148 | 970.37sqmi (2,513km) | |||
Prowers County | 099 | Lamar | 1889-04-11 | Split fromBent County. | Named in honor of John W. Prowers, a pioneer of theArkansas Rivervalley. | 12,551 | 1,645.37sqmi (4,261km) | ||
Pueblo County | 101 | Pueblo | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named for historic town ofPueblo.Pueblois a Spanish word meaningvillageorpeople. | 159,063 | 2,396.77sqmi (6,208km) | ||
Rio Blanco County | 103 | Meeker | 1889-03-25 | Split fromGarfield County. | Named for theWhite River, which was originally namedRio Blancoin Spanish. | 6,666 | 3,226.24sqmi (8,356km) | ||
Rio Grande County | 105 | Del Norte | 1874-02-10 | Split fromCostilla CountyandConejos Countycounties. | Named for theRio Grande, which flows through the area. | 11,982 | 913.10sqmi (2,365km) | ||
Routt County | 107 | Steamboat Springs | 1877-01-29 | Split fromGrand County. | Named in honor ofJohn Long Routt, the firstGovernorof the State of Colorado. | 23,509 | 2,362.11sqmi (6,118km) | ||
Saguache County | 109 | Saguache | 1866-12-29 | Split fromLakeandCostillacounties. | Name comes from aUte languagenoun meaning "sand dunes". | 6,108 | 3,168.32sqmi (8,206km) | ||
San Juan County | 111 | Silverton | 1876-01-31 | Split fromLake County. | Named for theSan Juan RiverandSan Juan Mountains, which in turn were named forSaint John the Evangelist. | 699 | 388.99sqmi (1,007km) | ||
San Miguel County | 113 | 1883-03-02 | Split fromSan Juan County. | Named for theSan Miguel RiverandSan Miguel Mountains, which in turn were named forSaint Michael the Archangel. | 7,359 | 1,290.76sqmi (3,343km) | |||
Sedgwick County | 115 | Julesburg | 1889-04-09 | Split fromLogan County. | Named for Fort Sedgwick, which, in turn, was named for U.S. Army GeneralJohn Sedgwick(1813 - 1864). | 2,379 | 548.83sqmi (1,421km) | ||
Summit County | 117 | Breckenridge | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named for the many highmountain summitsin the area. | 27,994 | 618.92sqmi (1,603km) | ||
Teller County | 119 | Cripple Creek | 1899-03-23 | Split fromEl PasoandFremontcounties. | Named in honor ofHenry Moore Teller, aU.S. SenatorfromColoradoandUnited States Secretary of the Interior. | 23,350 | 558.58sqmi (1,447km) | ||
Washington County | 121 | Akron | 1887-02-09 | Split fromWeld County. | Named in honor ofGeorge Washington(1732 - 1799), the firstPresident of the United States. | 4,814 | 2,522.90sqmi (6,534km) | ||
Weld County | 123 | Greeley | 1861-11-01 | Created as one of the 17 original counties of theTerritory of Colorado. | Named in honor of Lewis Ledyard Weld, the first Secretary of theTerritory of Colorado. | 252,825 | 4,013.84sqmi (10,396km) | ||
Yuma County | 125 | Wray | 1889-03-15 | Split fromWashington County. | Named for theQuechan (Yuma) NationofNative Americans. | 10,043 | 2,369.61sqmi (6,137km) |