Identifiers: city
| 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 | Corona (city), CA | 157,136 |
| 8 | Pomona (city), CA | 151,713 |
| 9 | Jurupa Valley (city), CA | 105,053 |
| 10 | Rialto (city), CA | 104,026 |
| 11 | Chino (city), CA | 91,403 |
| 12 | Upland (city), CA | 79,040 |
| 13 | Perris (city), CA | 78,700 |
| 14 | Redlands (city), CA | 73,168 |
| 15 | Eastvale (city), CA | 69,757 |
| 16 | Yorba Linda (city), CA | 68,336 |
| 17 | Highland (city), CA | 56,999 |
| 18 | Diamond Bar (city), CA | 55,072 |
| 19 | Colton (city), CA | 53,909 |
| 20 | Montclair (city), CA | 37,865 |