Identifiers: city · CDP · town
| Rank | Community | Population |
|---|---|---|
| 1 | Denver (city), CO | 715,522 |
| 2 | Aurora (city), CO | 386,261 |
| 3 | Lakewood (city), CO | 155,984 |
| 4 | Thornton (city), CO | 141,867 |
| 5 | Arvada (city), CO | 124,402 |
| 6 | Westminster (city), CO | 116,317 |
| 7 | Centennial (city), CO | 108,418 |
| 8 | Boulder (city), CO | 108,250 |
| 9 | Longmont (city), CO | 98,885 |
| 10 | Broomfield (city), CO | 74,112 |
| 11 | Commerce City (city), CO | 62,418 |
| 12 | Littleton (city), CO | 45,652 |
| 13 | Brighton (city), CO | 40,083 |
| 14 | Northglenn (city), CO | 38,131 |
| 15 | Dakota Ridge (CDP), CO | 33,892 |
| 16 | Ken Caryl (CDP), CO | 33,811 |
| 17 | Englewood (city), CO | 33,659 |
| 18 | Wheat Ridge (city), CO | 32,398 |
| 19 | Lafayette (city), CO | 30,411 |
| 20 | Erie (town), CO | 30,038 |