The 10 California cities with populations under 300,000 that added the most residents last year. The bulk of the increases in Chico and Oroville were people driven from their homes by the wildfire that destroyed most of the nearby city of Paradise.
| Rank | City | Overall Population | Residents Added |
| 1 | Chico | 112,111 | 19,250 |
| 2 | Irvine | 280,202 | 6,147 |
| 3 | Santa Clarita | 218,103 | 5,725 |
| 4 | Ontario | 178,268 | 4,024 |
| 5 | Oroville | 21,773 | 3,682 |
| 6 | Roseville | 139,643 | 3,383 |
| 7 | Chula Vista | 271,411 | 3,351 |
| 8 | Clovis | 117,003 | 3,108 |
| 9 | Manteca | 83,781 | 2,759 |
| 10 | Dublin | 64,577 | 2,703 |
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