27 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Greeley | Weld County | 114,833 |
| Grand Junction | Mesa County | 71,870 |
| Golden | Jefferson County | 20,140 |
| Greenwood Village | Arapahoe County | 14,909 |
| Glenwood Springs | Garfield County | 10,411 |
| Gunbarrel | Boulder County | 10,319 |
| Gypsum | Eagle County | 9,331 |
| Gunnison | Gunnison County | 6,973 |
| Gleneagle | El Paso County | 6,374 |
| Glendale | Arapahoe County | 4,345 |
| Genesee | Jefferson County | 4,155 |
| Granby | Grand County | 2,370 |
| Georgetown | Clear Creek County | 1,350 |
| Gilcrest | Weld County | 1,010 |
| Grand View Estates | Douglas County | 853 |
| Green Mountain Falls | El Paso County | 583 |
| Granada | Prowers County | 432 |
| Grand Lake | Grand County | 401 |
| Gerrard | Mineral County | 337 |
| Gold Hill | Boulder County | 254 |
| Garden City | Weld County | 248 |
| Goldfield | Teller County | 208 |
| Genoa | Lincoln County | 152 |
| Grover | Weld County | 151 |
| Glendale | Boulder County | 85 |
| Gardner | Huerfano County | 71 |
| Guffey | Park County | 36 |