Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Santa Maria (city), CA | 109,707 |
| 2 | San Luis Obispo (city), CA | 47,063 |
| 3 | Orcutt (CDP), CA | 32,034 |
| 4 | Arroyo Grande (city), CA | 18,441 |
| 5 | Nipomo (CDP), CA | 18,176 |
| 6 | Los Osos (CDP), CA | 14,465 |
| 7 | Grover Beach (city), CA | 12,701 |
| 8 | California Polytechnic State University (CDP), CA | 8,583 |
| 9 | Pismo Beach (city), CA | 8,072 |
| 10 | Guadalupe (city), CA | 8,057 |
| 11 | Oceano (CDP), CA | 7,183 |
| 12 | Woodlands (CDP), CA | 1,933 |
| 13 | Avila Beach (CDP), CA | 1,576 |
| 14 | Los Ranchos (CDP), CA | 1,516 |
| 15 | Santa Margarita (CDP), CA | 1,291 |
| 16 | Callender (CDP), CA | 1,282 |
| 17 | Blacklake (CDP), CA | 1,016 |
| 18 | Los Berros (CDP), CA | 623 |
| 19 | Garden Farms (CDP), CA | 449 |
| 20 | Edna (CDP), CA | 184 |