23 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Greeley | 1 | 116,900 | 109,289 | 1.1% | 2,310 | 51 | City |
| Windsor | 2 | 45,980 | 33,241 | 4.84% | 1,748 | 26 | Town |
| Evans | 3 | 22,445 | 22,292 | 0.12% | 2,137 | 11 | City |
| Johnstown | 4 | 22,275 | 17,367 | 3.81% | 1,443 | 15 | Town |
| Firestone | 5 | 20,762 | 16,664 | 3.4% | 1,494 | 14 | Town |
| Frederick | 6 | 19,544 | 14,722 | 4.29% | 1,285 | 15 | Town |
| Severance | 7 | 13,330 | 8,001 | 7.14% | 1,034 | 13 | Town |
| Fort Lupton | 8 | 10,918 | 8,007 | 4.65% | 809 | 13 | City |
| Milliken | 9 | 9,427 | 8,451 | 1.76% | 722 | 13 | Town |
| Mead | 10 | 7,701 | 4,802 | 6.69% | 498 | 15 | Town |
| Dacono | 11 | 6,946 | 6,351 | 1.45% | 749 | 9 | City |
| Eaton | 12 | 5,833 | 5,851 | -0.05% | 1,846 | 3 | Town |
| Ault | 13 | 3,030 | 1,919 | 6.5% | 1,717 | 2 | Town |
| Platteville | 14 | 2,876 | 2,960 | -0.48% | 855 | 3 | Town |
| Keenesburg | 15 | 2,451 | 1,259 | 8.84% | 265 | 9 | Town |
| La Salle | 16 | 2,274 | 2,360 | -0.61% | 2,323 | 1 | Town |
| Hudson | 17 | 1,602 | 1,647 | -0.44% | 271 | 6 | Town |
| Kersey | 18 | 1,493 | 1,510 | -0.2% | 667 | 2 | Town |
| Pierce | 19 | 1,081 | 1,099 | -0.28% | 582 | 2 | Town |
| Gilcrest | 20 | 1,014 | 1,022 | -0.1% | 1,250 | 1 | Town |
| Nunn | 21 | 548 | 502 | 1.48% | 138 | 4 | Town |
| Garden City | 22 | 249 | 252 | 0% | 2,204 | 0 | Town |
| Grover | 23 | 150 | 156 | -0.66% | 252 | 1 | Town |
Greeley is the largest city in Weld County, with a population of 116,900.
Grover is the smallest city in Weld County, with a population of 150.
There are 23 cities in Weld County, Colorado.