| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Greeley | 1 | 116,451 | 109,259 | 1.2% | 2,301 | 51 | City |
| Windsor | 2 | 46,001 | 33,231 | 4.93% | 1,749 | 26 | Town |
| Johnstown | 3 | 23,265 | 17,366 | 3.71% | 1,507 | 15 | Town |
| Evans | 4 | 22,552 | 22,293 | 0.23% | 2,148 | 11 | City |
| Firestone | 5 | 20,828 | 16,653 | 3.47% | 1,499 | 14 | Town |
| Frederick | 6 | 19,065 | 14,715 | 4.52% | 1,254 | 15 | Town |
| Severance | 7 | 12,740 | 8,011 | 7.59% | 988 | 13 | Town |
| Fort Lupton | 8 | 10,898 | 7,987 | 4.77% | 808 | 13 | City |
| Milliken | 9 | 9,355 | 8,449 | 1.87% | 716 | 13 | Town |
| Mead | 10 | 7,533 | 4,791 | 6.97% | 487 | 15 | Town |
| Dacono | 11 | 6,956 | 6,352 | 1.64% | 750 | 9 | City |
| Eaton | 12 | 5,852 | 5,846 | 0.07% | 1,852 | 3 | Town |
| Platteville | 13 | 2,896 | 2,959 | -0.41% | 861 | 3 | Town |
| Ault | 14 | 2,854 | 1,923 | 7.01% | 1,617 | 2 | Town |
| Keenesburg | 15 | 2,308 | 1,256 | 9.54% | 249 | 9 | Town |
| La Salle | 16 | 2,292 | 2,359 | -0.52% | 2,341 | 1 | Town |
| Hudson | 17 | 1,615 | 1,645 | -0.37% | 274 | 6 | Town |
| Kersey | 18 | 1,498 | 1,508 | -0.13% | 669 | 2 | Town |
| Pierce | 19 | 1,084 | 1,096 | -0.18% | 583 | 2 | Town |
| Gilcrest | 20 | 1,017 | 1,021 | 0% | 1,254 | 1 | Town |
| Nunn | 21 | 547 | 502 | 1.48% | 137 | 4 | Town |
| Garden City | 22 | 249 | 252 | -0.4% | 2,204 | 0 | Town |
| Grover | 23 | 151 | 155 | -0.66% | 254 | 1 | Town |
Greeley is the largest city in Weld County, with a population of 116,451.
Grover is the smallest city in Weld County, with a population of 151.
There are 23 cities in Weld County, Colorado.