Zip Code | City | Population |
|---|---|---|
| 95422 | Clearlake | 16,998 |
| 95451 | Kelseyville | 12,957 |
| 95453 | Lakeport | 11,254 |
| 95467 | Hidden Valley Lake | 5,795 |
| 95461 | Middletown | 3,909 |
| 95423 | Clearlake Oaks | 3,322 |
| 95458 | Lucerne | 3,303 |
| 95457 | Lower Lake | 3,252 |
| 95485 | Upper Lake | 2,909 |
| 95464 | Nice | 2,466 |
| 95426 | Cobb | 1,178 |
| 95435 | Finley | 347 |
| 95443 | Glenhaven | 190 |
| 95493 | Witter Springs | 144 |