Census ACS 2023 · 64 counties
Largest Counties in Colorado
Colorado has 64 counties with Census data available. The largest is El Paso County with a population of 736,008. County-level data is important because counties are the primary unit of local government in most states, responsible for courts, elections, public health, and infrastructure. Population distribution across counties reveals where growth is concentrated and where rural decline may be occurring.
Source: Census ACS 2023 5-Year Estimates
| # | County | Population | Median Income |
|---|---|---|---|
| 1 | Yuma County | 9,921 | $60,051 |
| 2 | Weld County | 340,711 | $93,287 |
| 3 | Washington County | 4,839 | $65,164 |
| 4 | Teller County | 24,774 | $80,666 |
| 5 | Summit County | 30,857 | $106,255 |
| 6 | Sedgwick County | 2,346 | $52,833 |
| 7 | San Miguel County | 8,026 | $80,117 |
| 8 | San Juan County | 690 | $73,889 |
| 9 | Saguache County | 6,511 | $54,283 |
| 10 | Routt County | 24,990 | $104,803 |
| 11 | Rio Grande County | 11,394 | $62,166 |
| 12 | Rio Blanco County | 6,518 | $72,620 |
| 13 | Pueblo County | 168,726 | $62,250 |
| 14 | Prowers County | 11,931 | $57,601 |
| 15 | Pitkin County | 17,119 | $100,318 |
| 16 | Phillips County | 4,491 | $60,372 |
| 17 | Park County | 17,739 | $95,450 |
| 18 | Ouray County | 5,024 | $84,556 |
| 19 | Otero County | 18,460 | $54,897 |
| 20 | Morgan County | 29,186 | $75,407 |
| 21 | Montrose County | 43,272 | $66,072 |
| 22 | Montezuma County | 26,204 | $63,005 |
| 23 | Moffat County | 13,258 | $70,975 |
| 24 | Mineral County | 799 | $52,455 |
| 25 | Mesa County | 157,316 | $71,485 |
| 26 | Logan County | 21,067 | $55,074 |
| 27 | Lincoln County | 5,561 | $54,257 |
| 28 | Las Animas County | 14,392 | $50,408 |
| 29 | Larimer County | 363,561 | $91,364 |
| 30 | Lake County | 7,411 | $93,655 |
| 31 | La Plata County | 56,088 | $85,296 |
| 32 | Kit Carson County | 7,015 | $59,810 |
| 33 | Kiowa County | 1,356 | $56,389 |
| 34 | Jefferson County | 579,715 | $107,800 |
| 35 | Jackson County | 1,422 | $41,809 |
| 36 | Huerfano County | 6,946 | $52,139 |
| 37 | Hinsdale County | 939 | $64,327 |
| 38 | Gunnison County | 17,158 | $77,358 |
| 39 | Grand County | 15,794 | $84,558 |
| 40 | Gilpin County | 5,877 | $88,654 |
| 41 | Garfield County | 62,034 | $86,172 |
| 42 | Fremont County | 49,394 | $61,027 |
| 43 | Elbert County | 27,152 | $129,477 |
| 44 | El Paso County | 736,008 | $87,470 |
| 45 | Eagle County | 55,374 | $103,174 |
| 46 | Douglas County | 368,283 | $145,737 |
| 47 | Dolores County | 2,385 | $70,490 |
| 48 | Denver County | 713,734 | $91,681 |
| 49 | Delta County | 31,353 | $58,330 |
| 50 | Custer County | 5,073 | $72,700 |
| 51 | Crowley County | 5,734 | $47,563 |
| 52 | Costilla County | 3,571 | $36,519 |
| 53 | Conejos County | 7,536 | $47,209 |
| 54 | Clear Creek County | 9,358 | $96,667 |
| 55 | Cheyenne County | 1,732 | $67,768 |
| 56 | Chaffee County | 19,876 | $70,909 |
| 57 | Broomfield County | 75,110 | $121,025 |
| 58 | Boulder County | 328,317 | $102,772 |
| 59 | Bent County | 5,524 | $49,194 |
| 60 | Baca County | 3,460 | $40,380 |
| 61 | Archuleta County | 13,730 | $76,524 |
| 62 | Arapahoe County | 655,709 | $97,215 |
| 63 | Alamosa County | 16,515 | $51,445 |
| 64 | Adams County | 524,408 | $91,387 |
More Rankings for Colorado
Frequently Asked Questions
El Paso County is the #1 ranked county in Colorado by population, with a value of 736,008 according to Census ACS 2023 data.
Colorado has 64 counties tracked in Census ACS 2023 data.
All data comes from the American Community Survey (ACS) 2023 5-Year estimates by the US Census Bureau.
Data from the American Community Survey 2023 5-Year estimates. Covers all counties in Colorado.