Colorado Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Denver | Denver | 756,840 |
| 2. | City of Colorado Springs | El Paso | 487,357 |
| 3. | City of Aurora | Adams | 378,727 |
| 4. | City of Fort Collins | Larimer | 173,035 |
| 5. | City of Lakewood | Jefferson | 157,481 |
| 6. | City of Thornton | Adams | 143,720 |
| 7. | City of Arvada | Jefferson | 124,956 |
| 8. | City of Westminster | Adams | 119,001 |
| 9. | City of Greeley | Weld | 114,039 |
| 10. | City of Pueblo | Pueblo | 113,408 |
| 11. | Highlands Ranch Census Designated Place | Douglas | 108,800 |
| 12. | City of Centennial | Arapahoe | 105,915 |
| 13. | City of Boulder | Boulder | 105,479 |
| 14. | City of Longmont | Boulder | 100,839 |
| 15. | City of Loveland | Larimer | 80,322 |
| 16. | Town of Castle Rock | Douglas | 75,237 |
| 17. | City of Broomfield | Broomfield | 74,336 |
| 18. | City of Grand Junction | Mesa | 67,323 |
| 19. | Town of Parker | Douglas | 60,737 |
| 20. | City of Commerce City | Adams | 59,954 |
