48 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Greeley | 1 | 115,631 | 108,809 | 1.11% | 2,339 | 49 | City |
| Greeley | 2 | 115,631 | 109,289 | 1.11% | 2,339 | 49 | City |
| Windsor | 3 | 43,857 | 32,722 | 5.09% | 1,683 | 26 | Town |
| Windsor | 4 | 43,857 | 33,241 | 5.09% | 1,683 | 26 | Town |
| Evans | 5 | 22,419 | 22,182 | 0.11% | 2,135 | 11 | City |
| Evans | 6 | 22,419 | 22,292 | 0.11% | 2,135 | 11 | City |
| Johnstown | 7 | 21,457 | 17,327 | 3.96% | 1,390 | 15 | Town |
| Johnstown | 8 | 21,457 | 17,367 | 3.96% | 1,390 | 15 | Town |
| Firestone | 9 | 20,079 | 16,372 | 3.52% | 1,445 | 14 | Town |
| Firestone | 10 | 20,079 | 16,664 | 3.52% | 1,445 | 14 | Town |
| Frederick | 11 | 18,740 | 14,527 | 4.48% | 1,232 | 15 | Town |
| Frederick | 12 | 18,740 | 14,722 | 4.48% | 1,232 | 15 | Town |
| Severance | 13 | 12,442 | 7,706 | 7.69% | 1,366 | 9 | Town |
| Severance | 14 | 12,442 | 8,001 | 7.69% | 1,366 | 9 | Town |
| Fort Lupton | 15 | 10,433 | 7,976 | 4.88% | 805 | 13 | City |
| Fort Lupton | 16 | 10,433 | 8,007 | 4.88% | 805 | 13 | City |
| Milliken | 17 | 9,264 | 8,379 | 1.78% | 709 | 13 | Town |
| Milliken | 18 | 9,264 | 8,451 | 1.78% | 709 | 13 | Town |
| Mead | 19 | 7,218 | 4,801 | 7.17% | 480 | 15 | Town |
| Mead | 20 | 7,218 | 4,802 | 7.17% | 480 | 15 | Town |
| Dacono | 21 | 6,847 | 6,302 | 1.47% | 738 | 9 | City |
| Dacono | 22 | 6,847 | 6,351 | 1.47% | 738 | 9 | City |
| Eaton | 23 | 5,836 | 5,811 | -0.05% | 1,847 | 3 | Town |
| Eaton | 24 | 5,836 | 5,851 | -0.05% | 1,847 | 3 | Town |
| Platteville | 25 | 2,890 | 2,959 | -0.48% | 926 | 3 | Town |
| Platteville | 26 | 2,890 | 2,960 | -0.48% | 926 | 3 | Town |
| Ault | 27 | 2,845 | 1,884 | 6.95% | 1,612 | 2 | Town |
| Ault | 28 | 2,845 | 1,919 | 6.95% | 1,612 | 2 | Town |
| La Salle | 29 | 2,288 | 2,361 | -0.65% | 2,337 | 1 | Town |
| La Salle | 30 | 2,288 | 2,360 | -0.65% | 2,337 | 1 | Town |
| Keenesburg | 31 | 2,252 | 1,257 | 9.64% | 243 | 9 | Town |
| Keenesburg | 32 | 2,252 | 1,259 | 9.64% | 243 | 9 | Town |
| Aristocrat Ranchettes | 33 | 2,148 | 2,080 | 2.58% | 1,734 | 1 | CDP |
| Hudson | 34 | 1,609 | 1,645 | -0.49% | 273 | 6 | Town |
| Hudson | 35 | 1,609 | 1,647 | -0.49% | 273 | 6 | Town |
| Kersey | 36 | 1,496 | 1,505 | -0.2% | 668 | 2 | Town |
| Kersey | 37 | 1,496 | 1,510 | -0.2% | 668 | 2 | Town |
| Pierce | 38 | 1,084 | 1,100 | -0.28% | 583 | 2 | Town |
| Pierce | 39 | 1,084 | 1,099 | -0.28% | 583 | 2 | Town |
| Gilcrest | 40 | 1,015 | 1,023 | -0.2% | 1,252 | 1 | Town |
| Gilcrest | 41 | 1,015 | 1,022 | -0.2% | 1,252 | 1 | Town |
| Nunn | 42 | 540 | 502 | 1.31% | 136 | 4 | Town |
| Nunn | 43 | 540 | 502 | 1.31% | 136 | 4 | Town |
| Garden City | 44 | 249 | 252 | -0.4% | 2,204 | 0 | Town |
| Garden City | 45 | 249 | 252 | -0.4% | 2,204 | 0 | Town |
| Briggsdale | 46 | 155 | 323 | 6.9% | 354 | 0 | CDP |
| Grover | 47 | 151 | 156 | -0.66% | 254 | 1 | Town |
| Grover | 48 | 151 | 156 | -0.66% | 254 | 1 | Town |
Greeley is the largest city in Weld County, with a population of 115,631.
Grover is the smallest city in Weld County, with a population of 151.
There are 48 cities in Weld County, Colorado.