Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Irvine (city), CA | 307,670 |
| 2 | Mission Viejo (city), CA | 93,653 |
| 3 | Lake Forest (city), CA | 85,858 |
| 4 | Newport Beach (city), CA | 85,239 |
| 5 | Tustin (city), CA | 80,276 |
| 6 | Laguna Niguel (city), CA | 64,355 |
| 7 | San Clemente (city), CA | 64,293 |
| 8 | Aliso Viejo (city), CA | 52,176 |
| 9 | Rancho Santa Margarita (city), CA | 47,949 |
| 10 | San Juan Capistrano (city), CA | 35,196 |
| 11 | Dana Point (city), CA | 33,107 |
| 12 | Laguna Hills (city), CA | 31,374 |
| 13 | Ladera Ranch (CDP), CA | 26,170 |
| 14 | Laguna Beach (city), CA | 23,032 |
| 15 | Laguna Woods (city), CA | 17,644 |
| 16 | Coto de Caza (CDP), CA | 14,710 |
| 17 | Camp Pendleton South (CDP), CA | 12,468 |
| 18 | Las Flores (CDP), CA | 5,995 |
| 19 | Williams Canyon (CDP), CA | 93 |