How many counties in Colorado? All 64 listed
Quick answer
Colorado has 64 counties and county equivalents holding 5,810,774 residents. The most populous county in Colorado is El Paso County with 736,008 residents; the smallest is San Juan County. County boundaries divide the state's land area — measured in square miles by the Census Bureau — into the units used for property assessment, elections and local sales tax. The statewide sales tax base rate is 2.9%, before county and city add-ons.
All 64 counties
Ranked by population, Census 2019-2023 ACS 5-year estimates.
| County | Population | Median income | Median home value | Median rent |
|---|---|---|---|---|
| El Paso County | 736,008 | $87,470 | $431,000 | $1,609 |
| Denver County | 713,734 | $91,681 | $586,700 | $1,770 |
| Arapahoe County | 655,709 | $97,215 | $526,000 | $1,812 |
| Jefferson County | 579,715 | $107,800 | $604,400 | $1,792 |
| Adams County | 524,408 | $91,387 | $458,400 | $1,713 |
| Douglas County | 368,283 | $145,737 | $674,000 | $2,095 |
| Larimer County | 363,561 | $91,364 | $532,200 | $1,677 |
| Weld County | 340,711 | $93,287 | $444,500 | $1,469 |
| Boulder County | 328,317 | $102,772 | $713,900 | $1,893 |
| Pueblo County | 168,726 | $62,250 | $271,800 | $1,059 |
| Mesa County | 157,316 | $71,485 | $349,400 | $1,154 |
| Broomfield County | 75,110 | $121,025 | $631,600 | $2,074 |
| Garfield County | 62,034 | $86,172 | $490,600 | $1,515 |
| La Plata County | 56,088 | $85,296 | $549,100 | $1,409 |
| Eagle County | 55,374 | $103,174 | $814,700 | $2,032 |
| Fremont County | 49,394 | $61,027 | $282,100 | $1,036 |
| Montrose County | 43,272 | $66,072 | $357,900 | $1,120 |
| Delta County | 31,353 | $58,330 | $318,000 | $1,080 |
| Summit County | 30,857 | $106,255 | $850,700 | $1,851 |
| Morgan County | 29,186 | $75,407 | $299,300 | $1,092 |
| Elbert County | 27,152 | $129,477 | $664,600 | $1,436 |
| Montezuma County | 26,204 | $63,005 | $308,100 | $974 |
| Routt County | 24,990 | $104,803 | $756,200 | $1,845 |
| Teller County | 24,774 | $80,666 | $445,000 | $1,746 |
| Logan County | 21,067 | $55,074 | $228,100 | $1,027 |
| Chaffee County | 19,876 | $70,909 | $598,500 | $1,514 |
| Otero County | 18,460 | $54,897 | $160,700 | $796 |
| Park County | 17,739 | $95,450 | $489,300 | $1,942 |
| Gunnison County | 17,158 | $77,358 | $597,200 | $1,191 |
| Pitkin County | 17,119 | $100,318 | $1,131,200 | $1,880 |
| Alamosa County | 16,515 | $51,445 | $218,800 | $904 |
| Grand County | 15,794 | $84,558 | $507,200 | $1,451 |
| Las Animas County | 14,392 | $50,408 | $214,500 | $875 |
| Archuleta County | 13,730 | $76,524 | $451,400 | $1,409 |
| Moffat County | 13,258 | $70,975 | $262,500 | $1,051 |
| Prowers County | 11,931 | $57,601 | $150,900 | $741 |
| Rio Grande County | 11,394 | $62,166 | $215,400 | $782 |
| Yuma County | 9,921 | $60,051 | $215,600 | $897 |
| Clear Creek County | 9,358 | $96,667 | $572,800 | $1,230 |
| San Miguel County | 8,026 | $80,117 | $613,100 | $1,173 |
| Conejos County | 7,536 | $47,209 | $162,100 | $724 |
| Lake County | 7,411 | $93,655 | $401,300 | $1,599 |
| Kit Carson County | 7,015 | $59,810 | $221,400 | $916 |
| Huerfano County | 6,946 | $52,139 | $256,700 | $739 |
| Rio Blanco County | 6,518 | $72,620 | $243,400 | $924 |
| Saguache County | 6,511 | $54,283 | $200,000 | $746 |
| Gilpin County | 5,877 | $88,654 | $512,600 | $1,340 |
| Crowley County | 5,734 | $47,563 | $106,700 | $976 |
| Lincoln County | 5,561 | $54,257 | $232,100 | $854 |
| Bent County | 5,524 | $49,194 | $137,900 | $854 |
| Custer County | 5,073 | $72,700 | $358,800 | $1,021 |
| Ouray County | 5,024 | $84,556 | $670,100 | $1,398 |
| Washington County | 4,839 | $65,164 | $218,300 | $991 |
| Phillips County | 4,491 | $60,372 | $255,300 | $947 |
| Costilla County | 3,571 | $36,519 | $171,300 | $857 |
| Baca County | 3,460 | $40,380 | $122,000 | $490 |
| Dolores County | 2,385 | $70,490 | $231,900 | $1,688 |
| Sedgwick County | 2,346 | $52,833 | $142,700 | $728 |
| Cheyenne County | 1,732 | $67,768 | $187,100 | $862 |
| Jackson County | 1,422 | $41,809 | $250,000 | $1,484 |
| Kiowa County | 1,356 | $56,389 | $148,600 | $869 |
| Hinsdale County | 939 | $64,327 | $438,800 | $1,099 |
| Mineral County | 799 | $52,455 | $413,000 | $903 |
| San Juan County | 690 | $73,889 | $406,900 | $1,076 |
Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year
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