Ranking of Colorado Counties By Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.30M people in Colorado with Unclassified ancestry. Among all Colorado counties, El Paso County had the highest population with Unclassified ancestry (176.24K), followed by Denver County (136.58K), and Arapahoe County (132.48K).
The chart and table below shows the top 10 counties with high number of people with Unclassified ancestry.
You can see similar information for other states and for other ancestry groups in Colorado.
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Related Topics: Colorado ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Colorado Counties By Population with Unclassified Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | El Paso County | 176239 |
| 2 | Denver County | 136581 |
| 3 | Arapahoe County | 132480 |
| 4 | Adams County | 130377 |
| 5 | Jefferson County | 126840 |
| 6 | Boulder County | 81503 |
| 7 | Weld County | 75635 |
| 8 | Douglas County | 72479 |
| 9 | Larimer County | 67267 |
| 10 | Pueblo County | 43698 |
| 11 | Mesa County | 39939 |
| 12 | Eagle County | 16367 |
| 13 | Fremont County | 16013 |
| 14 | Garfield County | 14447 |
| 15 | Broomfield County | 13220 |
| 16 | Montrose County | 12826 |
| 17 | La Plata County | 10970 |
| 18 | Summit County | 10816 |
| 19 | Routt County | 8583 |
| 20 | Delta County | 8538 |
| 21 | Elbert County | 7071 |
| 22 | Teller County | 6940 |
| 23 | Grand County | 6251 |
| 24 | Montezuma County | 5729 |
| 25 | Morgan County | 5661 |
| 26 | Logan County | 5332 |
| 27 | Chaffee County | 4628 |
| 28 | Pitkin County | 4593 |
| 29 | Park County | 4207 |
| 30 | Otero County | 3702 |
| 31 | Alamosa County | 3453 |
| 32 | Gunnison County | 3198 |
| 33 | Moffat County | 3057 |
| 34 | Las Animas County | 2749 |
| 35 | San Miguel County | 2566 |
| 36 | Yuma County | 2480 |
| 37 | Archuleta County | 2357 |
| 38 | Prowers County | 2268 |
| 39 | Huerfano County | 2239 |
| 40 | Clear Creek County | 2126 |
| 41 | Rio Grande County | 2100 |
| 42 | Kit Carson County | 1819 |
| 43 | Lake County | 1711 |
| 44 | Bent County | 1509 |
| 45 | Crowley County | 1484 |
| 46 | Rio Blanco County | 1470 |
| 47 | Conejos County | 1453 |
| 48 | Lincoln County | 1432 |
| 49 | Saguache County | 1409 |
| 50 | Washington County | 1343 |
| 51 | Custer County | 1291 |
| 52 | Phillips County | 1188 |
| 53 | Ouray County | 1179 |
| 54 | Gilpin County | 1053 |
| 55 | Baca County | 1038 |
| 56 | Jackson County | 588 |
| 56 | Sedgwick County | 588 |
| 57 | Costilla County | 469 |
| 58 | Cheyenne County | 414 |
| 59 | Kiowa County | 345 |
| 60 | Dolores County | 290 |
| 61 | San Juan County | 251 |
| 62 | Mineral County | 156 |
| 63 | Hinsdale County | 151 |
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