Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Riverside (city), CA | 314,998 |
| 2 | San Bernardino (city), CA | 222,101 |
| 3 | Moreno Valley (city), CA | 208,634 |
| 4 | Fontana (city), CA | 208,393 |
| 5 | Ontario (city), CA | 175,265 |
| 6 | Rancho Cucamonga (city), CA | 174,453 |
| 7 | Jurupa Valley (city), CA | 105,053 |
| 8 | Rialto (city), CA | 104,026 |
| 9 | Upland (city), CA | 79,040 |
| 10 | Redlands (city), CA | 73,168 |
| 11 | Eastvale (city), CA | 69,757 |
| 12 | Highland (city), CA | 56,999 |
| 13 | Yucaipa (city), CA | 54,542 |
| 14 | Colton (city), CA | 53,909 |
| 15 | Montclair (city), CA | 37,865 |
| 16 | Claremont (city), CA | 37,266 |
| 17 | La Verne (city), CA | 31,334 |
| 18 | Norco (city), CA | 26,316 |
| 19 | Loma Linda (city), CA | 24,791 |
| 20 | Bloomington (CDP), CA | 24,339 |