51 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| San Bernardino | 1 | 224,820 | 222,090 | 0.24% | 3,620 | 62.10 | City |
| Fontana | 2 | 219,657 | 209,177 | 0.96% | 5,075 | 43.28 | City |
| Ontario | 3 | 186,953 | 175,712 | 1.22% | 3,740 | 49.98 | City |
| Rancho Cucamonga | 4 | 174,219 | 174,683 | -0.05% | 3,746 | 46.51 | City |
| Victorville | 5 | 141,689 | 134,638 | 1% | 1,922 | 73.71 | City |
| Rialto | 6 | 102,933 | 104,077 | -0.22% | 4,272 | 24.09 | City |
| Hesperia | 7 | 101,065 | 99,984 | 0.21% | 1,391 | 72.68 | City |
| Chino | 8 | 94,498 | 91,038 | 0.74% | 3,195 | 29.57 | City |
| Upland | 9 | 78,467 | 79,046 | -0.15% | 5,035 | 15.58 | City |
| Chino Hills | 10 | 76,382 | 78,456 | -0.54% | 1,711 | 44.65 | City |
| Apple Valley | 11 | 74,488 | 75,858 | -0.37% | 967 | 77.01 | Town |
| Redlands | 12 | 72,103 | 73,235 | -0.31% | 2,002 | 36.01 | City |
| Highland | 13 | 55,664 | 57,009 | -0.48% | 2,997 | 18.57 | City |
| Yucaipa | 14 | 53,519 | 54,589 | -0.4% | 1,894 | 28.26 | City |
| Colton | 15 | 52,945 | 53,975 | -0.39% | 3,388 | 15.63 | City |
| Adelanto | 16 | 38,231 | 38,120 | 0.06% | 723 | 52.87 | City |
| Montclair | 17 | 37,281 | 37,941 | -0.35% | 6,740 | 5.53 | City |
| Twentynine Palms | 18 | 29,178 | 28,067 | 0.77% | 497 | 58.75 | City |
| Loma Linda | 19 | 25,260 | 24,887 | 0.3% | 2,891 | 8.74 | City |
| Barstow | 20 | 24,666 | 25,411 | -0.6% | 597 | 41.30 | City |
| Bloomington | 21 | 22,851 | 21,907 | -0.29% | 3,764 | 6.07 | CDP |
| Yucca Valley | 22 | 21,596 | 21,766 | -0.16% | 542 | 39.83 | Town |
| Phelan | 23 | 19,264 | 19,038 | 1.75% | 321 | 60.09 | CDP |
| Big Bear City | 24 | 12,865 | 12,621 | 0.29% | 402 | 32.02 | CDP |
| Grand Terrace | 25 | 12,795 | 13,155 | -0.56% | 3,632 | 3.52 | City |
| Muscoy | 26 | 12,092 | 11,546 | 0.81% | 3,976 | 3.04 | CDP |
| Mentone | 27 | 9,954 | 10,141 | 0.83% | 1,629 | 6.11 | CDP |
| Lake Arrowhead | 28 | 9,630 | 9,741 | -1.9% | 545 | 17.68 | CDP |
| Fort Irwin | 29 | 8,997 | 9,573 | 0.11% | 1,292 | 6.96 | CDP |
| Crestline | 30 | 8,976 | 9,351 | -1.32% | 646 | 13.90 | CDP |
| Spring Valley Lake | 31 | 8,900 | 8,408 | 0.51% | 2,943 | 3.02 | CDP |
| Oak Hills | 32 | 7,578 | 10,415 | -1.12% | 309 | 24.52 | CDP |
| Piñon Hills | 33 | 7,128 | 6,937 | -0.14% | 222 | 32.12 | CDP |
| Joshua Tree | 34 | 6,585 | 7,786 | -0.83% | 182 | 36.09 | CDP |
| Lucerne Valley | 35 | 6,312 | 5,694 | 0.53% | 60 | 105.63 | CDP |
| Silver Lakes | 36 | 5,509 | 6,050 | -0.14% | 1,053 | 5.23 | CDP |
| Big Bear Lake | 37 | 4,980 | 5,047 | -0.26% | 798 | 6.24 | City |
| Needles | 38 | 4,754 | 4,928 | -0.73% | 155 | 30.58 | City |
| Running Springs | 39 | 4,521 | 4,410 | -0.51% | 1,075 | 4.20 | CDP |
| Wrightwood | 40 | 4,445 | 4,362 | -0.11% | 747 | 5.95 | CDP |
| Lenwood | 41 | 4,134 | 4,431 | 0.95% | 1,987 | 2.08 | CDP |
| Mountain View Acres | 42 | 3,539 | 3,698 | 0.77% | 2,227 | 1.59 | CDP |
| Morongo Valley | 43 | 3,346 | 3,166 | -0.42% | 133 | 25.22 | CDP |
| San Antonio Heights | 44 | 3,275 | 3,113 | -0.18% | 1,339 | 2.45 | CDP |
| Homestead Valley | 45 | 2,424 | 2,619 | -1.66% | 72 | 33.86 | CDP |
| Searles Valley | 46 | 1,710 | 1,647 | -0.12% | 163 | 10.50 | CDP |
| Yermo | 47 | 1,226 | 1,082 | 7.17% | 1,889 | 0.65 | CDP |
| Big River | 48 | 953 | 1,158 | -2.56% | 88 | 10.83 | CDP |
| Baker | 49 | 508 | 602 | -2.87% | 189 | 2.69 | CDP |
| Lytle Creek | 50 | 485 | 656 | -2.81% | 81 | 6.02 | CDP |
| Bluewater | 51 | 166 | 142 | 0% | 159 | 1.05 | CDP |
San Bernardino is the largest city in San Bernardino County, with a population of 224,820.
Bluewater is the smallest city in San Bernardino County.
There are 51 cities in San Bernardino County, California.