| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oxnard | 1 | 199,197 | 201,900 | -0.23% | 7,504 | 27 | City |
| Simi Valley | 2 | 124,611 | 126,348 | -0.2% | 3,000 | 42 | City |
| Thousand Oaks | 3 | 121,431 | 126,810 | -0.65% | 2,198 | 55 | City |
| San Buenaventura (Ventura) | 4 | 109,698 | 110,621 | -0.2% | 5,015 | 22 | City |
| Camarillo | 5 | 68,334 | 70,729 | -0.46% | 3,471 | 20 | City |
| Moorpark | 6 | 34,818 | 36,251 | -0.59% | 2,836 | 12 | City |
| Santa Paula | 7 | 32,017 | 30,779 | 0.76% | 5,790 | 6 | City |
| Port Hueneme | 8 | 20,796 | 21,940 | -0.91% | 4,710 | 4 | City |
| Fillmore | 9 | 17,078 | 16,501 | 0.83% | 5,170 | 3 | City |
| Ojai | 10 | 7,447 | 7,623 | -0.36% | 1,710 | 4 | City |
Oxnard is the largest city in Ventura County, with a population of 199,197.
Ojai is the smallest city in Ventura County, with a population of 7,447.
There are 10 cities in Ventura County, California.