10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oxnard | 1 | 200,293 | 201,908 | -0.16% | 7,545 | 27 | City |
| Simi Valley | 2 | 125,635 | 126,347 | -0.11% | 3,024 | 42 | City |
| Thousand Oaks | 3 | 123,582 | 126,814 | -0.52% | 2,236 | 55 | City |
| San Buenaventura (Ventura) | 4 | 109,630 | 110,632 | -0.18% | 5,012 | 22 | City |
| Camarillo | 5 | 69,671 | 70,721 | -0.3% | 3,539 | 20 | City |
| Moorpark | 6 | 35,464 | 36,247 | -0.44% | 2,889 | 12 | City |
| Santa Paula | 7 | 32,037 | 30,780 | 0.79% | 5,793 | 6 | City |
| Port Hueneme | 8 | 21,171 | 21,940 | -0.72% | 4,795 | 4 | City |
| Fillmore | 9 | 17,394 | 16,503 | 1.03% | 5,266 | 3 | City |
| Ojai | 10 | 7,544 | 7,636 | -0.25% | 1,732 | 4 | City |
Oxnard is the largest city in Ventura County, with a population of 200,293.
Ojai is the smallest city in Ventura County, with a population of 7,544.
There are 10 cities in Ventura County, California.