15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| San Jose | 1 | 994,288 | 1,009,686 | -0.31% | 5,588 | 178 | City |
| Sunnyvale | 2 | 157,174 | 155,261 | 0.24% | 7,125 | 22 | City |
| Santa Clara | 3 | 134,263 | 128,606 | 0.85% | 7,346 | 18 | City |
| Mountain View | 4 | 88,451 | 82,773 | 1.3% | 7,397 | 12 | City |
| Milpitas | 5 | 79,736 | 79,786 | -0.01% | 5,915 | 13 | City |
| Palo Alto | 6 | 67,483 | 68,356 | -0.26% | 2,806 | 24 | City |
| Gilroy | 7 | 60,637 | 59,399 | 0.41% | 3,667 | 17 | City |
| Cupertino | 8 | 58,393 | 59,978 | -0.54% | 5,149 | 11 | City |
| Morgan Hill | 9 | 46,018 | 45,687 | 0.14% | 3,557 | 13 | City |
| Campbell | 10 | 42,672 | 43,787 | -0.52% | 7,017 | 6 | City |
| Los Gatos | 11 | 32,835 | 33,418 | -0.36% | 2,842 | 12 | Town |
| Los Altos | 12 | 30,742 | 31,351 | -0.4% | 4,701 | 7 | City |
| Saratoga | 13 | 30,378 | 30,918 | -0.35% | 2,377 | 13 | City |
| Los Altos Hills | 14 | 8,421 | 8,490 | -0.17% | 929 | 9 | Town |
| Monte Sereno | 15 | 3,586 | 3,470 | 0.65% | 2,195 | 2 | City |
San Jose is the largest city in Santa Clara County, with a population of 994,288.
Monte Sereno is the smallest city in Santa Clara County, with a population of 3,586.
There are 15 cities in Santa Clara County, California.