17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Yuma | 1 | 103,070 | 97,540 | 1.08% | 852 | 121.04 | City |
| San Luis | 2 | 39,551 | 35,588 | 2.05% | 1,169 | 33.82 | City |
| Fortuna Foothills | 3 | 27,874 | 29,297 | 0.39% | 696 | 40.08 | CDP |
| Somerton | 4 | 14,836 | 14,231 | 0.82% | 2,040 | 7.27 | City |
| Avenue B C | 5 | 3,769 | 3,847 | -0.71% | 5,213 | 0.72 | CDP |
| Wellton | 6 | 2,698 | 2,383 | 2.39% | 93 | 28.97 | Town |
| Gadsden | 7 | 807 | 873 | 1.13% | 413 | 1.95 | CDP |
| Rancho Mesa Verde | 8 | 593 | 861 | -0.34% | 5,295 | 0.11 | CDP |
| Tacna | 9 | 504 | 580 | -1.37% | 262 | 1.92 | CDP |
| Donovan Estates | 10 | 493 | 1,325 | -12.12% | 3,913 | 0.13 | CDP |
| Yuma Proving Ground | 11 | 391 | 251 | 7.12% | 291 | 1.34 | CDP |
| El Prado Estates | 12 | 363 | 590 | -2.42% | 375 | 0.97 | CDP |
| Dateland | 13 | 322 | 411 | -1.83% | 15 | 21.95 | CDP |
| Wall Lane | 14 | 286 | 411 | -3.05% | 654 | 0.44 | CDP |
| Wellton Hills | 15 | 177 | 397 | -2.75% | 277 | 0.64 | CDP |
| Drysdale | 16 | 92 | 389 | -11.54% | 561 | 0.16 | CDP |
| Orange Grove Mobile Manor | 17 | 58 | 387 | -38.3% | 921 | 0.06 | CDP |
Yuma is the largest city in Yuma County, with a population of 103,070.
Orange Grove Mobile Manor is the smallest city in Yuma County.
There are 17 cities in Yuma County, Arizona.