Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Santa Maria (city), CA | 109,707 |
| 2 | Lompoc (city), CA | 44,444 |
| 3 | Orcutt (CDP), CA | 32,034 |
| 4 | Vandenberg Village (CDP), CA | 7,308 |
| 5 | Buellton (city), CA | 5,161 |
| 6 | Mission Hills (CDP), CA | 3,571 |
| 7 | Vandenberg AFB (CDP), CA | 3,559 |
| 8 | Los Alamos (CDP), CA | 1,839 |
| 9 | Casmalia (CDP), CA | 147 |