22 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Oxnard | 1 | 196,206 | 201,911 | -0.58% | 7,391 | 26.55 | City |
| Simi Valley | 2 | 124,293 | 126,343 | -0.33% | 2,992 | 41.54 | City |
| Thousand Oaks | 3 | 121,222 | 126,824 | -0.92% | 2,194 | 55.26 | City |
| San Buenaventura (Ventura) | 4 | 108,016 | 110,620 | -0.48% | 4,938 | 21.87 | City |
| Camarillo | 5 | 68,706 | 70,725 | -0.58% | 3,490 | 19.69 | City |
| Moorpark | 6 | 35,074 | 36,246 | -0.66% | 2,857 | 12.28 | City |
| Santa Paula | 7 | 32,471 | 30,773 | 1.06% | 5,872 | 5.53 | City |
| Port Hueneme | 8 | 20,709 | 21,979 | -1.21% | 4,691 | 4.42 | City |
| Fillmore | 9 | 17,650 | 16,499 | 1.32% | 5,344 | 3.30 | City |
| Oak Park | 10 | 13,581 | 13,987 | -0.11% | 2,565 | 5.29 | CDP |
| Ojai | 11 | 7,355 | 7,632 | -0.74% | 1,688 | 4.36 | City |
| Oak View | 12 | 7,069 | 6,557 | 2.93% | 2,075 | 3.41 | CDP |
| Mira Monte | 13 | 6,833 | 6,833 | -0.01% | 1,419 | 4.82 | CDP |
| El Rio | 14 | 6,223 | 6,506 | -1.03% | 3,088 | 2.02 | CDP |
| Meiners Oaks | 15 | 4,000 | 3,697 | 0.73% | 1,641 | 2.44 | CDP |
| Channel Islands Beach | 16 | 2,609 | 2,699 | -1.25% | 6,168 | 0.42 | CDP |
| Casa Conejo | 17 | 2,576 | 3,184 | -1.72% | 5,458 | 0.47 | CDP |
| Santa Rosa Valley | 18 | 2,301 | 2,721 | -2.91% | 319 | 7.21 | CDP |
| Piru | 19 | 2,212 | 2,126 | 0.45% | 696 | 3.18 | CDP |
| Saticoy | 20 | 1,778 | 1,739 | 2.89% | 4,754 | 0.37 | CDP |
| Somis | 21 | 1,354 | 1,189 | 7.12% | 404 | 3.35 | CDP |
| Santa Susana | 22 | 1,156 | 924 | 0.7% | 919 | 1.26 | CDP |
Oxnard is the largest city in Ventura County, with a population of 196,206.
Santa Susana is the smallest city in Ventura County.
There are 22 cities in Ventura County, California.