| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Susanville | 1 | 11,885 | 16,443 | -7.26% | 1,501 | 8 | City |
Susanville is the largest city in Lassen County, with a population of 11,885.
Susanville is the smallest city in Lassen County, with a population of 11,885.
There is 1 city in Lassen County, California.