Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Riverside (city), CA | 314,998 |
| 2 | San Bernardino (city), CA | 222,101 |
| 3 | Fontana (city), CA | 208,393 |
| 4 | Rancho Cucamonga (city), CA | 174,453 |
| 5 | Jurupa Valley (city), CA | 105,053 |
| 6 | Rialto (city), CA | 104,026 |
| 7 | Redlands (city), CA | 73,168 |
| 8 | Highland (city), CA | 56,999 |
| 9 | Yucaipa (city), CA | 54,542 |
| 10 | Colton (city), CA | 53,909 |
| 11 | Loma Linda (city), CA | 24,791 |
| 12 | Bloomington (CDP), CA | 24,339 |
| 13 | Grand Terrace (city), CA | 13,150 |
| 14 | Muscoy (CDP), CA | 10,719 |
| 15 | Calimesa (city), CA | 10,026 |
| 16 | Mentone (CDP), CA | 9,557 |
| 17 | Highgrove (CDP), CA | 7,515 |
| 18 | Cherry Valley (CDP), CA | 6,509 |
| 19 | Running Springs (CDP), CA | 5,268 |
| 20 | March ARB (CDP), CA | 809 |