Colorado Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Denver | Denver | 737,963 |
| 2. | City of Colorado Springs | El Paso | 500,213 |
| 3. | City of Aurora | Adams | 400,818 |
| 4. | City of Fort Collins | Larimer | 172,250 |
| 5. | City of Lakewood | Jefferson | 157,788 |
| 6. | City of Thornton | Adams | 146,305 |
| 7. | City of Arvada | Jefferson | 125,235 |
| 8. | City of Westminster | Adams | 117,903 |
| 9. | City of Greeley | Weld | 113,400 |
| 10. | City of Pueblo | Pueblo | 112,912 |
| 11. | City of Centennial | Arapahoe | 108,676 |
| 12. | City of Boulder | Boulder | 108,663 |
| 13. | Highlands Ranch Census Designated Place | Douglas | 103,114 |
| 14. | City of Longmont | Boulder | 102,263 |
| 15. | Town of Castle Rock | Douglas | 81,673 |
| 16. | City of Broomfield | Broomfield | 79,283 |
| 17. | City of Loveland | Larimer | 77,978 |
| 18. | City of Commerce City | Adams | 69,710 |
| 19. | City of Grand Junction | Mesa | 68,137 |
| 20. | Town of Parker | Douglas | 63,610 |
