27 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Greeley | Weld County | 116,900 |
| Grand Junction | Mesa County | 72,951 |
| Golden | Jefferson County | 20,027 |
| Greenwood Village | Arapahoe County | 15,111 |
| Gunbarrel | Boulder County | 10,692 |
| Glenwood Springs | Garfield County | 10,462 |
| Gypsum | Eagle County | 9,778 |
| Gunnison | Gunnison County | 6,944 |
| Gleneagle | El Paso County | 6,114 |
| Glendale | Arapahoe County | 4,397 |
| Genesee | Jefferson County | 3,876 |
| Granby | Grand County | 2,415 |
| Georgetown | Clear Creek County | 1,324 |
| Gilcrest | Weld County | 1,014 |
| Grand View Estates | Douglas County | 784 |
| Green Mountain Falls | El Paso County | 588 |
| Granada | Prowers County | 447 |
| Grand Lake | Grand County | 396 |
| Gerrard | Mineral County | 378 |
| Gold Hill | Boulder County | 301 |
| Garden City | Weld County | 249 |
| Goldfield | Teller County | 197 |
| Genoa | Lincoln County | 154 |
| Grover | Weld County | 150 |
| Glendale | Boulder County | 87 |
| Gardner | Huerfano County | 73 |
| Guffey | Park County | 36 |