Identifiers: city · CDP · town
| Rank | Community | Population |
|---|---|---|
| 1 | Oakland (city), CA | 440,646 |
| 2 | Fremont (city), CA | 230,504 |
| 3 | Hayward (city), CA | 162,954 |
| 4 | Tracy (city), CA | 93,000 |
| 5 | San Leandro (city), CA | 91,008 |
| 6 | Livermore (city), CA | 87,955 |
| 7 | San Ramon (city), CA | 84,605 |
| 8 | Milpitas (city), CA | 80,273 |
| 9 | Pleasanton (city), CA | 79,871 |
| 10 | Dublin (city), CA | 72,589 |
| 11 | Union City (city), CA | 70,143 |
| 12 | Walnut Creek (city), CA | 70,127 |
| 13 | Castro Valley (CDP), CA | 66,441 |
| 14 | Danville (town), CA | 43,582 |
| 15 | San Lorenzo (CDP), CA | 29,581 |
| 16 | Lafayette (city), CA | 25,391 |
| 17 | Mountain House (city), CA | 24,499 |
| 18 | Ashland (CDP), CA | 23,823 |
| 19 | Cherryland (CDP), CA | 15,808 |
| 20 | Alamo (CDP), CA | 15,314 |