Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Susanville | 1 | 11,443 | 16,426 | -9.82% | 1,445 | 7.9 | City |
| Janesville | 2 | 2,846 | 2,803 | 3.72% | 84 | 33.8 | CDP |
| Herlong | 3 | 1,444 | 1,272 | 6.02% | 866 | 1.7 | CDP |
| Johnstonville | 4 | 1,101 | 1,151 | 0.46% | 128 | 8.6 | CDP |
| Doyle | 5 | 1,051 | 745 | 2.54% | 172 | 6.1 | CDP |
| Westwood | 6 | 1,028 | 1,387 | -4.1% | 185 | 5.6 | CDP |
| Patton Village | 7 | 807 | 635 | 0.88% | 231 | 3.5 | CDP |
| Lake Almanor Country Club | 8 | 547 | 429 | 1.67% | 199 | 2.7 | CDP |
| Hamilton Branch | 9 | 440 | 446 | -1.57% | 406 | 1.1 | CDP |
| McArthur | 10 | 440 | 521 | 1.85% | 440 | 1.0 | CDP |
| Chilcoot-Vinton | 11 | 361 | 340 | -1.64% | 27 | 13.2 | CDP |
| Clear Creek | 12 | 330 | 293 | 3.77% | 291 | 1.1 | CDP |
| Lake Almanor Peninsula | 13 | 313 | 382 | -0.95% | 103 | 3.0 | CDP |
| Spaulding | 14 | 242 | 129 | 1.68% | 73 | 3.3 | CDP |
| East Shore | 15 | 218 | 139 | 2.35% | 184 | 1.2 | CDP |
| Stones Landing | 16 | 168 | 102 | 7.69% | 79 | 2.1 | CDP |
| Bieber | 17 | 124 | 145 | -10.14% | 36 | 3.5 | CDP |
| Litchfield | 18 | 124 | 183 | -3.88% | 31 | 4.0 | CDP |
| Nubieber | 19 | 49 | 31 | 6.52% | 65 | 0.7 | CDP |
| Madeline | 20 | 36 | 11 | 5.88% | 679 | 0.1 | CDP |
| Little Valley | 21 | 12 | 19 | 9.09% | 29 | 0.4 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Susanville is the largest city in Lassen County.
Little Valley is the smallest city in Lassen County.
There are 21 cities in Lassen County, California.