10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oxnard | 1 | 199,970 | 201,908 | -0.16% | 7,533 | 27 | City |
| Simi Valley | 2 | 125,493 | 126,347 | -0.11% | 3,021 | 42 | City |
| Thousand Oaks | 3 | 122,936 | 126,814 | -0.52% | 2,225 | 55 | City |
| San Buenaventura (Ventura) | 4 | 109,430 | 110,632 | -0.18% | 5,003 | 22 | City |
| Camarillo | 5 | 69,461 | 70,721 | -0.3% | 3,528 | 20 | City |
| Moorpark | 6 | 35,308 | 36,247 | -0.44% | 2,876 | 12 | City |
| Santa Paula | 7 | 32,289 | 30,780 | 0.79% | 5,839 | 6 | City |
| Port Hueneme | 8 | 21,017 | 21,940 | -0.73% | 4,760 | 4 | City |
| Fillmore | 9 | 17,572 | 16,503 | 1.02% | 5,320 | 3 | City |
| Ojai | 10 | 7,526 | 7,636 | -0.24% | 1,728 | 4 | City |
Oxnard is the largest city in Ventura County, with a population of 199,970.
Ojai is the smallest city in Ventura County, with a population of 7,526.
There are 10 cities in Ventura County, California.