15 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| San Jose | 1 | 991,209 | 1,009,686 | -0.31% | 5,570 | 178 | City |
| Sunnyvale | 2 | 157,557 | 155,261 | 0.24% | 7,142 | 22 | City |
| Santa Clara | 3 | 135,395 | 128,606 | 0.84% | 7,408 | 18 | City |
| Mountain View | 4 | 89,587 | 82,773 | 1.28% | 7,492 | 12 | City |
| Milpitas | 5 | 79,726 | 79,786 | -0.01% | 5,914 | 13 | City |
| Palo Alto | 6 | 67,309 | 68,356 | -0.26% | 2,799 | 24 | City |
| Gilroy | 7 | 60,885 | 59,399 | 0.41% | 3,682 | 17 | City |
| Cupertino | 8 | 58,076 | 59,978 | -0.54% | 5,121 | 11 | City |
| Morgan Hill | 9 | 46,084 | 45,687 | 0.14% | 3,562 | 13 | City |
| Campbell | 10 | 42,449 | 43,787 | -0.52% | 6,981 | 6 | City |
| Los Gatos | 11 | 32,719 | 33,418 | -0.35% | 2,832 | 12 | Town |
| Los Altos | 12 | 30,620 | 31,351 | -0.4% | 4,682 | 7 | City |
| Saratoga | 13 | 30,270 | 30,918 | -0.36% | 2,369 | 13 | City |
| Los Altos Hills | 14 | 8,407 | 8,490 | -0.17% | 927 | 9 | Town |
| Monte Sereno | 15 | 3,609 | 3,470 | 0.64% | 2,209 | 2 | City |
San Jose is the largest city in Santa Clara County, with a population of 991,209.
Monte Sereno is the smallest city in Santa Clara County, with a population of 3,609.
There are 15 cities in Santa Clara County, California.