Colorado Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Denver | Denver | 762,261 |
| 2. | City of Colorado Springs | El Paso | 507,798 |
| 3. | City of Aurora | Adams | 411,108 |
| 4. | City of Fort Collins | Larimer | 173,039 |
| 5. | City of Lakewood | Jefferson | 160,249 |
| 6. | City of Thornton | Adams | 147,989 |
| 7. | City of Arvada | Jefferson | 126,176 |
| 8. | City of Westminster | Adams | 118,363 |
| 9. | City of Greeley | Weld | 117,846 |
| 10. | City of Pueblo | Pueblo | 112,964 |
| 11. | City of Centennial | Arapahoe | 109,974 |
| 12. | City of Boulder | Boulder | 109,191 |
| 13. | City of Longmont | Boulder | 103,506 |
| 14. | Highlands Ranch Census Designated Place | Douglas | 102,979 |
| 15. | Town of Castle Rock | Douglas | 84,869 |
| 16. | City of Broomfield | Broomfield | 81,206 |
| 17. | City of Loveland | Larimer | 79,815 |
| 18. | City of Commerce City | Adams | 73,145 |
| 19. | City of Grand Junction | Mesa | 69,574 |
| 20. | Town of Parker | Douglas | 68,086 |
