Identifiers: city · town · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Santa Rosa (city), CA | 178,127 |
| 2 | Petaluma (city), CA | 59,776 |
| 3 | Novato (city), CA | 53,225 |
| 4 | Rohnert Park (city), CA | 44,390 |
| 5 | Windsor (town), CA | 26,344 |
| 6 | Healdsburg (city), CA | 11,340 |
| 7 | Larkfield-Wikiup (CDP), CA | 8,492 |
| 8 | Cotati (city), CA | 7,584 |
| 9 | Sebastopol (city), CA | 7,521 |
| 10 | El Verano (CDP), CA | 3,867 |
| 11 | Forestville (CDP), CA | 3,264 |
| 12 | Sonoma State University (CDP), CA | 2,679 |
| 13 | Penngrove (CDP), CA | 2,637 |
| 14 | Graton (CDP), CA | 1,683 |
| 15 | Black Point-Green Point (CDP), CA | 1,431 |
| 16 | Kenwood (CDP), CA | 852 |
| 17 | Petaluma Center (CDP), CA | 709 |
| 18 | Fulton (CDP), CA | 551 |
| 19 | Bloomfield (CDP), CA | 338 |
| 20 | Tomales (CDP), CA | 187 |