Colorado Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Denver | Denver | 740,948 |
| 2. | City of Colorado Springs | El Paso | 502,097 |
| 3. | City of Aurora | Adams | 405,572 |
| 4. | City of Fort Collins | Larimer | 172,581 |
| 5. | City of Lakewood | Jefferson | 157,940 |
| 6. | City of Thornton | Adams | 146,718 |
| 7. | City of Arvada | Jefferson | 124,327 |
| 8. | City of Westminster | Adams | 117,276 |
| 9. | City of Greeley | Weld | 116,186 |
| 10. | City of Pueblo | Pueblo | 112,507 |
| 11. | City of Centennial | Arapahoe | 110,208 |
| 12. | City of Boulder | Boulder | 107,656 |
| 13. | Highlands Ranch Census Designated Place | Douglas | 102,811 |
| 14. | City of Longmont | Boulder | 101,902 |
| 15. | Town of Castle Rock | Douglas | 83,367 |
| 16. | City of Broomfield | Broomfield | 80,488 |
| 17. | City of Loveland | Larimer | 78,526 |
| 18. | City of Commerce City | Adams | 71,421 |
| 19. | City of Grand Junction | Mesa | 69,289 |
| 20. | Town of Parker | Douglas | 66,699 |
