Counties in Colorado
Colorado has 64 counties. Find yours from your location, or explore the map and the full list with seats, population, time zones and FIPS codes.
Updated · Data: U.S. Census Bureau
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Colorado has 64 counties, home to about 5,810,774 people. Sort the table by any column, or search by name or seat.
Counties64Mountain time
Most peopleEl Paso County736,008 residents, 13% of the state
Fewest peopleSan Juan County690 residents (survey estimate; small counties have wide margins of error)
Most crowdedDenver County4,662 people per sq mi
Largest by landLas Animas County4,772.9 sq mi
Priciest homesPitkin Countymedian value $1,131,200
Colorado county map
Population6903.5k5.9k9.9k17k29k157kno data
County explorer: all 64 counties in Colorado
| County | Seat | Population | Land sq mi | People / sq mi | Median home | Time zone | FIPS |
|---|---|---|---|---|---|---|---|
| El Paso | Colorado Springs | 736,008 | 2,126.4 | 346 | $431,000 | Mountain | 08041 |
| Denver | Denver | 713,734 | 153.1 | 4,662 | $586,700 | Mountain | 08031 |
| Arapahoe | Littleton | 655,709 | 797.9 | 822 | $526,000 | Mountain | 08005 |
| Jefferson | Golden | 579,715 | 764.4 | 758 | $604,400 | Mountain | 08059 |
| Adams | Brighton | 524,408 | 1,166.8 | 449 | $458,400 | Mountain | 08001 |
| Douglas | Castle Rock | 368,283 | 840.9 | 438 | $674,000 | Mountain | 08035 |
| Larimer | Fort Collins | 363,561 | 2,595.7 | 140 | $532,200 | Mountain | 08069 |
| Weld | Greeley | 340,711 | 3,985.0 | 85 | $444,500 | Mountain | 08123 |
| Boulder | Boulder | 328,317 | 726.4 | 452 | $713,900 | Mountain | 08013 |
| Pueblo | Pueblo | 168,726 | 2,386.6 | 71 | $271,800 | Mountain | 08101 |
| Mesa | Grand Junction | 157,316 | 3,328.7 | 47 | $349,400 | Mountain | 08077 |
| Broomfield | - | 75,110 | 33.0 | 2,276 | $631,600 | Mountain | 08014 |
| Garfield | Glenwood Springs | 62,034 | 2,947.4 | 21 | $490,600 | Mountain | 08045 |
| La Plata | Durango | 56,088 | 1,689.7 | 33 | $549,100 | Mountain | 08067 |
| Eagle | Eagle | 55,374 | 1,684.5 | 33 | $814,700 | Mountain | 08037 |
| Fremont | Cañon City | 49,394 | 1,533.8 | 32 | $282,100 | Mountain | 08043 |
| Montrose | Montrose | 43,272 | 2,240.9 | 19 | $357,900 | Mountain | 08085 |
| Delta | Delta | 31,353 | 1,142.1 | 27 | $318,000 | Mountain | 08029 |
| Summit | Breckenridge | 30,857 | 608.3 | 51 | $850,700 | Mountain | 08117 |
| Morgan | Fort Morgan | 29,186 | 1,280.5 | 23 | $299,300 | Mountain | 08087 |
| Elbert | Kiowa | 27,152 | 1,850.1 | 15 | $664,600 | Mountain | 08039 |
| Montezuma | Cortez | 26,204 | 2,029.3 | 13 | $308,100 | Mountain | 08083 |
| Routt | Steamboat Springs | 24,990 | 2,362.0 | 11 | $756,200 | Mountain | 08107 |
| Teller | Cripple Creek | 24,774 | 557.1 | 44 | $445,000 | Mountain | 08119 |
| Logan | Sterling | 21,067 | 1,838.6 | 11 | $228,100 | Mountain | 08075 |
| Chaffee | Salida | 19,876 | 1,013.4 | 20 | $598,500 | Mountain | 08015 |
| Otero | La Junta | 18,460 | 1,261.9 | 15 | $160,700 | Mountain | 08089 |
| Park | Fairplay | 17,739 | 2,193.5 | 8 | $489,300 | Mountain | 08093 |
| Gunnison | Gunnison | 17,158 | 3,239.1 | 5 | $597,200 | Mountain | 08051 |
| Pitkin | Aspen | 17,119 | 970.7 | 18 | $1,131,200 | Mountain | 08097 |
| Alamosa | Alamosa | 16,515 | 722.6 | 23 | $218,800 | Mountain | 08003 |
| Grand | Hot Sulphur Springs | 15,794 | 1,846.4 | 9 | $507,200 | Mountain | 08049 |
| Las Animas | Trinidad | 14,392 | 4,772.9 | 3 | $214,500 | Mountain | 08071 |
| Archuleta | Pagosa Springs | 13,730 | 1,350.1 | 10 | $451,400 | Mountain | 08007 |
| Moffat | Craig | 13,258 | 4,743.2 | 3 | $262,500 | Mountain | 08081 |
| Prowers | Lamar | 11,931 | 1,638.4 | 7 | $150,900 | Mountain | 08099 |
| Rio Grande | Del Norte | 11,394 | 912.0 | 12 | $215,400 | Mountain | 08105 |
| Yuma | Wray | 9,921 | 2,364.4 | 4 | $215,600 | Mountain | 08125 |
| Clear Creek | Georgetown | 9,358 | 395.1 | 24 | $572,800 | Mountain | 08019 |
| San Miguel | Telluride | 8,026 | 1,286.7 | 6 | $613,100 | Mountain | 08113 |
| Conejos | Conejos | 7,536 | 1,287.4 | 6 | $162,100 | Mountain | 08021 |
| Lake | Leadville | 7,411 | 376.9 | 20 | $401,300 | Mountain | 08065 |
| Kit Carson | Burlington | 7,015 | 2,160.8 | 3 | $221,400 | Mountain | 08063 |
| Huerfano | Walsenburg | 6,946 | 1,591.0 | 4 | $256,700 | Mountain | 08055 |
| Rio Blanco | Meeker | 6,518 | 3,221.0 | 2 | $243,400 | Mountain | 08103 |
| Saguache | Saguache | 6,511 | 3,168.6 | 2 | $200,000 | Mountain | 08109 |
| Gilpin | Central City | 5,877 | 150.0 | 39 | $512,600 | Mountain | 08047 |
| Crowley | Ordway | 5,734 | 787.4 | 7 | $106,700 | Mountain | 08025 |
| Lincoln | Hugo | 5,561 | 2,577.7 | 2 | $232,100 | Mountain | 08073 |
| Bent | Las Animas | 5,524 | 1,512.8 | 4 | $137,900 | Mountain | 08011 |
| Custer | Westcliffe | 5,073 | 738.6 | 7 | $358,800 | Mountain | 08027 |
| Ouray | Ouray | 5,024 | 540.7 | 9 | $670,100 | Mountain | 08091 |
| Washington | Akron | 4,839 | 2,518.1 | 2 | $218,300 | Mountain | 08121 |
| Phillips | Holyoke | 4,491 | 687.9 | 7 | $255,300 | Mountain | 08095 |
| Costilla | San Luis | 3,571 | 1,227.6 | 3 | $171,300 | Mountain | 08023 |
| Baca | Springfield | 3,460 | 2,555.0 | 1 | $122,000 | Mountain | 08009 |
| Dolores | Dove Creek | 2,385 | 1,067.2 | 2 | $231,900 | Mountain | 08033 |
| Sedgwick | Julesburg | 2,346 | 548.0 | 4 | $142,700 | Mountain | 08115 |
| Cheyenne | Cheyenne Wells | 1,732 | 1,778.3 | 1 | $187,100 | Mountain | 08017 |
| Jackson | Walden | 1,422 | 1,613.7 | 1 | $250,000 | Mountain | 08057 |
| Kiowa | Eads | 1,356 | 1,767.8 | 1 | $148,600 | Mountain | 08061 |
| Hinsdale | Lake City | 939 | 1,117.2 | 1 | $438,800 | Mountain | 08053 |
| Mineral | Creede | 799 | 875.8 | 1 | $413,000 | Mountain | 08079 |
| San Juan | Silverton | 690 | 387.5 | 2 | $406,900 | Mountain | 08111 |
Which Colorado cities are in more than one county?
- Aurora: Arapahoe County 86.4%, Adams County 12.8%, Douglas County 0.8% of residents
- Arvada: Jefferson County 97.7%, Adams County 2.3% of residents
- Westminster: Adams County 61.0%, Jefferson County 39.0% of residents
- Longmont: Boulder County 98.7%, Weld County 1.3% of residents
- Littleton: Arapahoe County 93.7%, Jefferson County 4.3%, Douglas County 2.0% of residents
- Brighton: Adams County 98.9%, Weld County 1.1% of residents
- Windsor: Weld County 77.1%, Larimer County 22.9% of residents
- Erie: Weld County 58.4%, Boulder County 41.6% of residents
- Columbine: Jefferson County 92.0%, Arapahoe County 8.0% of residents
- Johnstown: Weld County 72.7%, Larimer County 27.3% of residents
- Berthoud: Larimer County 97.7%, Weld County 2.3% of residents
- Basalt: Eagle County 73.9%, Pitkin County 26.1% of residents
Sources: Census TIGER/Line 2024; ACS 2019-2023 5-year; Wikidata, CC0 (seats); timezone-boundary-builder (time zones). Data as of November 1, 2026. Not affiliated with any government agency.
FAQ
Frequently asked questions
How many counties are in Colorado?
64.
What is the most populated county in Colorado?
El Paso County, with about 736,008 people (13% of the state).
What is the least populated county in Colorado?
San Juan County, with about 690 people (a survey estimate with a wide margin of error).
What is the largest county in Colorado by land?
Las Animas County, 4,772.9 sq mi of land.
What county am I in, in Colorado?
Use the tool at the top of this page: press Use my current location, or type your city or ZIP code.