25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Greeley | 1 | 114,833 | 109,272 | 0.98% | 2,323 | 49.43 | City |
| Windsor | 2 | 45,095 | 33,230 | 5.55% | 1,730 | 26.06 | Town |
| Evans | 3 | 22,353 | 22,285 | 0.06% | 2,129 | 10.50 | City |
| Johnstown | 4 | 20,939 | 17,369 | 3.53% | 1,356 | 15.44 | Town |
| Firestone | 5 | 19,873 | 16,663 | 3.34% | 1,430 | 13.90 | Town |
| Frederick | 6 | 19,644 | 14,724 | 5.27% | 1,292 | 15.21 | Town |
| Severance | 7 | 12,704 | 7,993 | 8.01% | 1,395 | 9.11 | Town |
| Fort Lupton | 8 | 10,408 | 8,005 | 4.85% | 803 | 12.95 | City |
| Milliken | 9 | 9,498 | 8,462 | 2.23% | 727 | 13.06 | Town |
| Mead | 10 | 7,546 | 4,805 | 7.83% | 502 | 15.04 | Town |
| Dacono | 11 | 6,759 | 6,349 | 1.23% | 729 | 9.28 | City |
| Eaton | 12 | 5,824 | 5,844 | -0.07% | 1,843 | 3.16 | Town |
| Ault | 13 | 3,158 | 1,928 | 8.45% | 1,789 | 1.76 | Town |
| Platteville | 14 | 2,858 | 2,957 | -0.69% | 915 | 3.12 | Town |
| Keenesburg | 15 | 2,578 | 1,257 | 11.41% | 278 | 9.26 | Town |
| La Salle | 16 | 2,263 | 2,358 | -0.83% | 2,312 | 0.98 | Town |
| Aristocrat Ranchettes | 17 | 2,148 | 2,080 | 2.58% | 1,734 | 1.24 | CDP |
| Hudson | 18 | 1,595 | 1,649 | -0.68% | 270 | 5.90 | Town |
| Kersey | 19 | 1,478 | 1,510 | -0.4% | 660 | 2.24 | Town |
| Pierce | 20 | 1,068 | 1,097 | -0.56% | 575 | 1.86 | Town |
| Gilcrest | 21 | 1,010 | 1,034 | -0.49% | 1,245 | 0.81 | Town |
| Nunn | 22 | 550 | 502 | 1.85% | 138 | 3.98 | Town |
| Garden City | 23 | 248 | 252 | -0.4% | 2,195 | 0.11 | Town |
| Briggsdale | 24 | 155 | 323 | 6.9% | 354 | 0.44 | CDP |
| Grover | 25 | 151 | 155 | -0.66% | 254 | 0.59 | Town |
Greeley is the largest city in Weld County, with a population of 114,833.
Grover is the smallest city in Weld County.
There are 25 cities in Weld County, Colorado.