12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Alturas | 1 | 2,622 | 2,709 | -0.64% | 924 | 2.84 | City |
| Cedarville | 2 | 850 | 711 | 2.66% | 156 | 5.44 | CDP |
| Newell | 3 | 426 | 481 | -0.47% | 177 | 2.40 | CDP |
| Canby | 4 | 329 | 295 | 0.3% | 143 | 2.30 | CDP |
| California Pines | 5 | 210 | 367 | -9.09% | 28 | 7.43 | CDP |
| Daphnedale Park | 6 | 185 | 145 | 0% | 224 | 0.83 | CDP |
| Fort Bidwell | 7 | 168 | 174 | 0% | 52 | 3.20 | CDP |
| New Pine Creek | 8 | 99 | 47 | 7.61% | 44 | 2.27 | CDP |
| Adin | 9 | 53 | 209 | -22.06% | 18 | 2.93 | CDP |
| Lookout | 10 | 46 | 50 | 6.98% | 8 | 5.46 | CDP |
| Lake City | 11 | 40 | 86 | 8.11% | 7 | 5.82 | CDP |
| Eagleville | 12 | 16 | 15 | 6.67% | 16 | 0.97 | CDP |
Alturas is the largest city in Modoc County, with a population of 2,622.
Eagleville is the smallest city in Modoc County.
There are 12 cities in Modoc County, California.