Colorado Population By County in 2018
Updated on January 29, 2024.
According to the US Census Bureau population estimates, there were 5,697,155 people living in Colorado in 2018. Denver County was the most populated county with 716,340 residents, followed by El Paso County with 712,746 residents, and Arapahoe County with 652,395 residents. San Juan County with a population of 760 was the least populated county in Colorado in 2018.
Use the map below to interactively explore the population for each county in Colorado in 2018. The data can also be explored further by sorting and filtering with the table below.
You can see similar information for other states and by state for the United States.
Related Topics: Colorado Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Colorado Population By County (2018)
Table of Colorado Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Adams | 511,485 | 8.98% |
| Alamosa | 16,235 | 0.28% |
| Arapahoe | 652,395 | 11.45% |
| Archuleta | 13,670 | 0.24% |
| Baca | 3,587 | 0.06% |
| Bent | 5,793 | 0.10% |
| Boulder | 325,438 | 5.71% |
| Broomfield | 69,431 | 1.22% |
| Chaffee | 20,066 | 0.35% |
| Cheyenne | 1,864 | 0.03% |
| Clear Creek | 9,552 | 0.17% |
| Conejos | 8,154 | 0.14% |
| Costilla | 3,803 | 0.07% |
| Crowley | 5,886 | 0.10% |
| Custer | 4,962 | 0.09% |
| Delta | 30,835 | 0.54% |
| Denver | 716,340 | 12.57% |
| Dolores | 2,056 | 0.04% |
| Douglas | 343,780 | 6.03% |
| Eagle | 55,087 | 0.97% |
| Elbert | 26,267 | 0.46% |
| El Paso | 712,746 | 12.51% |
| Fremont | 48,070 | 0.84% |
| Garfield | 59,722 | 1.05% |
| Gilpin | 6,131 | 0.11% |
| Grand | 15,556 | 0.27% |
| Gunnison | 17,177 | 0.30% |
| Hinsdale | 786 | 0.01% |
| Huerfano | 6,877 | 0.12% |
| Jackson | 1,403 | 0.03% |
| Jefferson | 580,027 | 10.18% |
| Kiowa | 1,385 | 0.02% |
| Kit Carson | 7,166 | 0.13% |
| Lake | 7,807 | 0.14% |
| La Plata | 56,511 | 0.99% |
| Larimer | 351,045 | 6.16% |
| Las Animas | 14,460 | 0.25% |
| Lincoln | 5,595 | 0.10% |
| Logan | 22,286 | 0.39% |
| Mesa | 153,339 | 2.69% |
| Mineral | 774 | 0.01% |
| Moffat | 13,148 | 0.23% |
| Montezuma | 26,303 | 0.46% |
| Montrose | 42,309 | 0.74% |
| Morgan | 28,754 | 0.51% |
| Otero | 18,354 | 0.32% |
| Ouray | 4,834 | 0.09% |
| Park | 18,583 | 0.33% |
| Phillips | 4,343 | 0.08% |
| Pitkin | 18,066 | 0.32% |
| Prowers | 12,038 | 0.21% |
| Pueblo | 167,574 | 2.94% |
| Rio Blanco | 6,347 | 0.11% |
| Rio Grande | 11,274 | 0.20% |
| Routt | 25,489 | 0.45% |
| Saguache | 6,837 | 0.12% |
| San Juan | 760 | 0.01% |
| San Miguel | 8,195 | 0.14% |
| Sedgwick | 2,284 | 0.04% |
| Summit | 30,771 | 0.54% |
| Teller | 25,158 | 0.44% |
| Washington | 4,861 | 0.09% |
| Weld | 315,360 | 5.54% |
| Yuma | 9,964 | 0.18% |