Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | San Bernardino (city), CA | 222,101 |
| 2 | Fontana (city), CA | 208,393 |
| 3 | Ontario (city), CA | 175,265 |
| 4 | Rancho Cucamonga (city), CA | 174,453 |
| 5 | Pomona (city), CA | 151,713 |
| 6 | Fullerton (city), CA | 143,617 |
| 7 | Pasadena (city), CA | 138,699 |
| 8 | East Los Angeles (CDP), CA | 118,786 |
| 9 | West Covina (city), CA | 109,501 |
| 10 | El Monte (city), CA | 109,450 |
| 11 | Jurupa Valley (city), CA | 105,053 |
| 12 | Rialto (city), CA | 104,026 |
| 13 | Chino (city), CA | 91,403 |
| 14 | Alhambra (city), CA | 82,868 |
| 15 | Upland (city), CA | 79,040 |
| 16 | Baldwin Park (city), CA | 72,176 |
| 17 | La Habra (city), CA | 63,097 |
| 18 | Montebello (city), CA | 62,640 |
| 19 | Pico Rivera (city), CA | 62,088 |
| 20 | Monterey Park (city), CA | 61,096 |