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List of Colorado Counties and County Seats

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The U.S. state of Colorado is divided into 64 counties. Explore list of California Counties and their County Seats in alphabetical order and check their population, areas and the date of formation.

List of Colorado Counties and County Seat

CountyCounty SeatPopulation (2011)Area Formed
Adams CountyBrighton441,6031,182.29 sq mi1902-11-15
Alamosa CountyAlamosa15,445723.21 sq mi1913-03-08
Arapahoe CountyLittleton572,003804.41 sq mi1861-11-01
Archuleta CountyPagosa Springs12,0841,354.53 sq mi1885-04-14
Baca CountySpringfield3,7882,558.48 sq mi1889-04-16
Bent CountyLas Animas6,4991,541.07 sq mi1870-02-11
Boulder CountyBoulder294,567740.48 sq mi1861-11-01
Chaffee CountySalida17,8091,014.12 sq mi1879-02-10
Cheyenne CountyCheyenne Wells1,8361,781.90 sq mi1889-03-25
City and County of BroomfieldBroomfield55,88933.57 sq mi2001-11-15
City and County of DenverDenver600,158155.66 sq mi1902-11-15
Clear Creek CountyGeorgetown9,088396.53 sq mi1861-11-01
Conejos CountyConejos8,2561,290.22 sq mi1861-11-01
Costilla CountySan Luis3,5241,229.38 sq mi1861-11-01
Crowley CountyOrdway5,823800.27 sq mi1911-05-29
Custer CountyWestcliffe4,255739.24 sq mi1877-03-09
Delta CountyDelta30,9521,149.44 sq mi1883-02-11
Dolores CountyDove Creek2,0641,076.93 sq mi1881-03-04
Douglas CountyCastle Rock285,465842.30 sq mi1861-11-01
Eagle CountyEagle52,1971,700.76 sq mi1883-02-11
El Paso CountyColorado Springs622,2632,128.60 sq mi1861-11-01
Elbert CountyKiowa23,0861,849.08 sq mi1874-02-02
Fremont CountyCaƱon City46,8241,533.09 sq mi1861-11-01
Garfield CountyGlenwood Springs56,3892,958.23 sq mi1883-02-10
Gilpin CountyCentral City5,441150.15 sq mi1861-11-01
Grand CountyHot Sulphur Springs14,8431,868.53 sq mi1874-02-02
Gunnison CountyGunnison15,3243,259.22 sq mi1877-03-09
Hinsdale CountyLake City8431,123.35 sq mi1874-02-10
Huerfano CountyWalsenburg6,7111,592.37 sq mi1861-11-01
Jackson CountyWalden1,3941,619.75 sq mi1909-05-05
Jefferson CountyGolden534,543772.85 sq mi1861-11-01
Kiowa CountyEads1,3981,785.90 sq mi1889-04-11
Kit Carson CountyBurlington8,2702,162.43 sq mi1889-04-11
La Plata CountyDurango51,3341,700.44 sq mi1874-02-10
Lake CountyLeadville7,310383.55 sq mi1861-11-01
Larimer CountyFort Collins299,6302,631.75 sq mi1861-11-01
Las Animas CountyTrinidad15,5074,773.27 sq mi1866-02-09
Lincoln CountyHugo5,4672,585.21 sq mi1889-04-11
Logan CountySterling22,7091,845.31 sq mi1887-02-25
Mesa CountyGrand Junction146,7233,345.69 sq mi1883-02-14
Mineral CountyCreede712878.16 sq mi1893-03-27
Moffat CountyCraig13,7954,755.86 sq mi1911-02-27
Montezuma CountyCortez25,5352,035.80 sq mi1889-04-16
Montrose CountyMontrose41,2762,246.43 sq mi1883-02-11
Morgan CountyFort Morgan28,1591,293.83 sq mi1889-02-19
Otero CountyLa Junta18,8311,267.66 sq mi1889-03-25
Ouray CountyOuray4,436542.30 sq mi1877-01-18
Park CountyFairplay16,2062,209.36 sq mi1861-11-01
Phillips CountyHolyoke4,442688.30 sq mi1889-03-27
Pitkin CountyAspen17,148970.37 sq mi1881-02-23
Prowers CountyLamar12,5511,645.37 sq mi1889-04-11
Pueblo CountyPueblo159,0632,396.77 sq mi1861-11-01
Rio Blanco CountyMeeker6,6663,226.24 sq mi1889-03-25
Rio Grande CountyDel Norte11,982913.10 sq mi1874-02-10
Routt CountySteamboat Springs23,5092,362.11 sq mi1877-01-29
Saguache CountySaguache6,1083,168.32 sq mi1866-12-29
San Juan CountySilverton699388.99 sq mi1876-01-31
San Miguel CountyTelluride7,3591,290.76 sq mi1883-03-02
Sedgwick CountyJulesburg2,379548.83 sq mi1889-04-09
Summit CountyBreckenridge27,994618.92 sq mi1861-11-01
Teller CountyCripple Creek23,350558.58 sq mi1899-03-23
Washington CountyAkron4,8142,522.90 sq mi1887-02-09
Weld CountyGreeley252,8254,013.84 sq mi1861-11-01
Yuma CountyWray10,0432,369.61 sq mi1889-03-15