| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Roseville | 1 | 171,058 | 148,517 | 2.25% | 3,880 | 44 | City |
| Rocklin | 2 | 77,733 | 71,783 | 1.19% | 3,924 | 20 | City |
| Lincoln | 3 | 58,906 | 49,969 | 2.68% | 2,401 | 25 | City |
| Auburn | 4 | 13,848 | 13,782 | 0.01% | 1,929 | 7 | City |
| Loomis | 5 | 7,031 | 6,827 | 0.39% | 968 | 7 | Town |
| Colfax | 6 | 2,060 | 1,971 | 0.83% | 1,465 | 1 | City |
Roseville is the largest city in Placer County, with a population of 171,058.
Colfax is the smallest city in Placer County, with a population of 2,060.
There are 6 cities in Placer County, California.