22 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 |
| Oak Park | 10 | 13,581 | 13,987 | -0.11% | 2,565 | 5 | CDP |
| Ojai | 11 | 7,544 | 7,636 | -0.25% | 1,732 | 4 | City |
| Oak View | 12 | 7,069 | 6,557 | 2.93% | 2,075 | 3 | CDP |
| Mira Monte | 13 | 6,833 | 6,833 | -0.01% | 1,419 | 5 | CDP |
| El Rio | 14 | 6,223 | 6,506 | -1.03% | 3,088 | 2 | CDP |
| Meiners Oaks | 15 | 4,000 | 3,697 | 0.73% | 1,641 | 2 | CDP |
| Channel Islands Beach | 16 | 2,609 | 2,699 | -1.25% | 6,168 | 0 | CDP |
| Casa Conejo | 17 | 2,576 | 3,184 | -1.72% | 5,458 | 0 | CDP |
| Santa Rosa Valley | 18 | 2,301 | 2,721 | -2.91% | 319 | 7 | CDP |
| Piru | 19 | 2,212 | 2,126 | 0.45% | 696 | 3 | CDP |
| Saticoy | 20 | 1,778 | 1,739 | 2.89% | 4,754 | 0 | CDP |
| Somis | 21 | 1,354 | 1,189 | 7.12% | 404 | 3 | CDP |
| Santa Susana | 22 | 1,156 | 924 | 0.7% | 919 | 1 | CDP |
Oxnard is the largest city in Ventura County, with a population of 200,293.
Santa Susana is the smallest city in Ventura County, with a population of 1,156.
There are 22 cities in Ventura County, California.