Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Clearlake (city), CA | 16,685 |
| 2 | Hidden Valley Lake (CDP), CA | 6,235 |
| 3 | Lakeport (city), CA | 5,026 |
| 4 | Clearlake Riviera (CDP), CA | 3,410 |
| 5 | Kelseyville (CDP), CA | 3,382 |
| 6 | Clearlake Oaks (CDP), CA | 2,551 |
| 7 | Cobb (CDP), CA | 1,295 |
| 8 | Lower Lake (CDP), CA | 1,276 |
| 9 | Soda Bay (CDP), CA | 1,163 |
| 10 | Middletown (CDP), CA | 1,114 |
| 11 | Spring Valley (CDP), CA | 964 |