| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| San Jose | 1 | 984,378 | 1,009,573 | -0.55% | 5,532 | 178 | City |
| Sunnyvale | 2 | 156,622 | 155,240 | 0.03% | 7,100 | 22 | City |
| Santa Clara | 3 | 134,386 | 128,614 | 0.7% | 7,353 | 18 | City |
| Mountain View | 4 | 86,090 | 82,773 | 0.76% | 7,199 | 12 | City |
| Milpitas | 5 | 78,328 | 79,809 | -0.34% | 5,810 | 13 | City |
| Palo Alto | 6 | 67,324 | 68,354 | -0.42% | 2,799 | 24 | City |
| Gilroy | 7 | 60,889 | 59,452 | 0.21% | 3,682 | 17 | City |
| Cupertino | 8 | 57,889 | 59,983 | -0.76% | 5,105 | 11 | City |
| Morgan Hill | 9 | 45,579 | 45,670 | -0.1% | 3,523 | 13 | City |
| Campbell | 10 | 42,161 | 43,797 | -0.77% | 6,933 | 6 | City |
| Los Gatos | 11 | 32,379 | 33,413 | -0.6% | 2,802 | 12 | Town |
| Los Altos | 12 | 30,801 | 31,348 | -0.53% | 4,710 | 7 | City |
| Saratoga | 13 | 30,251 | 30,919 | -0.55% | 2,367 | 13 | City |
| Los Altos Hills | 14 | 8,388 | 8,490 | -0.37% | 925 | 9 | Town |
| Monte Sereno | 15 | 3,581 | 3,471 | 0.42% | 2,192 | 2 | City |
San Jose is the largest city in Santa Clara County, with a population of 984,378.
Monte Sereno is the smallest city in Santa Clara County, with a population of 3,581.
There are 15 cities in Santa Clara County, California.