14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clearlake | 1 | 16,337 | 16,697 | -0.44% | 1,613 | 10.13 | City |
| Hidden Valley Lake | 2 | 5,920 | 5,948 | 0.37% | 603 | 9.82 | CDP |
| Lakeport | 3 | 5,204 | 5,031 | 0.68% | 1,702 | 3.06 | City |
| Clearlake Riviera | 4 | 4,804 | 4,408 | 2.43% | 908 | 5.29 | CDP |
| Kelseyville | 5 | 3,947 | 3,657 | 1.02% | 1,368 | 2.88 | CDP |
| Lucerne | 6 | 3,090 | 2,674 | 0.06% | 575 | 5.37 | CDP |
| North Lakeport | 7 | 2,504 | 3,067 | -2.11% | 660 | 3.80 | CDP |
| Nice | 8 | 2,304 | 2,407 | -1.2% | 1,334 | 1.73 | CDP |
| Clearlake Oaks | 9 | 2,003 | 2,194 | -1.14% | 1,013 | 1.98 | CDP |
| Middletown | 10 | 1,854 | 725 | 1.92% | 1,005 | 1.84 | CDP |
| Lower Lake | 11 | 1,334 | 1,065 | 0.23% | 500 | 2.67 | CDP |
| Upper Lake | 12 | 930 | 1,250 | -0.85% | 543 | 1.71 | CDP |
| Soda Bay | 13 | 695 | 714 | -2.93% | 541 | 1.28 | CDP |
| Cobb | 14 | 412 | 805 | -18.09% | 83 | 4.98 | CDP |
Clearlake is the largest city in Lake County, with a population of 16,337.
Cobb is the smallest city in Lake County.
There are 14 cities in Lake County, California.