Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Vallejo (city), CA | 126,090 |
| 2 | Fairfield (city), CA | 119,881 |
| 3 | Vacaville (city), CA | 102,386 |
| 4 | Napa (city), CA | 79,246 |
| 5 | Suisun City (city), CA | 29,518 |
| 6 | Benicia (city), CA | 27,131 |
| 7 | Hercules (city), CA | 26,016 |
| 8 | American Canyon (city), CA | 21,837 |
| 9 | Pinole (city), CA | 19,022 |
| 10 | El Sobrante (CDP), CA | 15,524 |
| 11 | Sonoma (city), CA | 10,739 |
| 12 | Rodeo (CDP), CA | 9,653 |
| 13 | Boyes Hot Springs (CDP), CA | 6,215 |
| 14 | Tara Hills (CDP), CA | 5,364 |
| 15 | Vine Hill (CDP), CA | 4,323 |
| 16 | Fetters Hot Springs-Agua Caliente (CDP), CA | 4,233 |
| 17 | Pacheco (CDP), CA | 4,183 |
| 18 | El Verano (CDP), CA | 3,867 |
| 19 | Yountville (city), CA | 3,436 |
| 20 | Crockett (CDP), CA | 3,242 |
Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Vallejo (city), CA | 126,090 |
| 2 | Fairfield (city), CA | 119,881 |
| 3 | Napa (city), CA | 79,246 |
| 4 | Suisun City (city), CA | 29,518 |
| 5 | American Canyon (city), CA | 21,837 |
| 6 | Sonoma (city), CA | 10,739 |
| 7 | Boyes Hot Springs (CDP), CA | 6,215 |
| 8 | St. Helena (city), CA | 5,430 |
| 9 | Fetters Hot Springs-Agua Caliente (CDP), CA | 4,233 |
| 10 | El Verano (CDP), CA | 3,867 |
| 11 | Yountville (city), CA | 3,436 |
| 12 | Crockett (CDP), CA | 3,242 |
| 13 | Green Valley (CDP), CA | 1,654 |
| 14 | Deer Park (CDP), CA | 1,294 |
| 15 | Silverado Resort (CDP), CA | 948 |
| 16 | Moskowite Corner (CDP), CA | 237 |
| 17 | Rutherford (CDP), CA | 115 |
| 18 | Oakville (CDP), CA | 49 |