24 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| San Bernardino | 1 | 226,103 | 222,119 | 0.29% | 3,641 | 62 | City |
| Fontana | 2 | 223,089 | 209,186 | 1.05% | 5,155 | 43 | City |
| Ontario | 3 | 190,066 | 175,723 | 1.27% | 3,803 | 50 | City |
| Rancho Cucamonga | 4 | 177,673 | 174,678 | 0.28% | 3,820 | 47 | City |
| Victorville | 5 | 143,721 | 134,721 | 1.05% | 1,950 | 74 | City |
| Rialto | 6 | 105,395 | 103,963 | 0.23% | 4,375 | 24 | City |
| Hesperia | 7 | 102,771 | 99,966 | 0.46% | 1,414 | 73 | City |
| Chino | 8 | 95,492 | 91,046 | 0.78% | 3,182 | 30 | City |
| Upland | 9 | 80,002 | 79,047 | 0.2% | 5,134 | 16 | City |
| Chino Hills | 10 | 76,898 | 78,457 | -0.34% | 1,722 | 45 | City |
| Redlands | 11 | 74,796 | 73,244 | 0.35% | 2,077 | 36 | City |
| Apple Valley | 12 | 74,614 | 75,858 | -0.28% | 969 | 77 | Town |
| Highland | 13 | 56,261 | 56,975 | -0.21% | 3,030 | 19 | City |
| Yucaipa | 14 | 54,394 | 54,607 | -0.06% | 1,925 | 28 | City |
| Colton | 15 | 53,305 | 53,974 | -0.21% | 3,411 | 16 | City |
| Adelanto | 16 | 37,856 | 38,110 | -0.11% | 716 | 53 | City |
| Montclair | 17 | 37,502 | 37,946 | -0.2% | 6,780 | 6 | City |
| Twentynine Palms | 18 | 25,814 | 28,060 | -1.43% | 439 | 59 | City |
| Loma Linda | 19 | 25,336 | 24,918 | 0.28% | 2,828 | 9 | City |
| Barstow | 20 | 24,640 | 25,411 | -0.52% | 597 | 41 | City |
| Yucca Valley | 21 | 21,904 | 21,766 | 0.11% | 550 | 40 | Town |
| Grand Terrace | 22 | 12,891 | 13,155 | -0.34% | 3,659 | 4 | City |
| Big Bear Lake | 23 | 5,045 | 5,042 | 0.02% | 808 | 6 | City |
| Needles | 24 | 4,792 | 4,932 | -0.48% | 157 | 31 | City |
San Bernardino is the largest city in San Bernardino County, with a population of 226,103.
Needles is the smallest city in San Bernardino County, with a population of 4,792.
There are 24 cities in San Bernardino County, California.