| 1990 Census | Estimate | Estimate | Forecast | Forecast | Forecast | Forecast | Forecast | Projection | |
| Area | 4/1/90 | 1/1/94 | 1/1/98 | 2000 | 2005 | 2010 | 2015 | 2020 | 2025 |
| Camarillo | 18,731 | 19,911 | 20,894 | 22,778 | 24,139 | 25,500 | 26,527 | 27,554 | 28,581 |
| Fillmore | 3,528 | 3,671 | 3,804 | 3,951 | 4,317 | 4,684 | 5,066 | 5,448 | 5,830 |
| Moorpark | 7,915 | 8,292 | 9,075 | 9,523 | 11,370 | 13,218 | 15,065 | 15,628 | 16,191 |
| Ojai | 3,130 | 3,165 | 3,217 | 3,381 | 3,482 | 3,583 | 3,684 | 3,785 | 3,886 |
| Oxnard | 41,247 | 42,571 | 43,451 | 44,593 | 47,448 | 50,304 | 53,159 | 56,014 | 58,869 |
| Port Hueneme | 7,481 | 7,661 | 7,680 | 9,579 | 10,355 | 11,130 | 12,130 | 13,130 | 14,130 |
| Santa Paula | 8,062 | 8,418 | 8,462 | 10,235 | 11,072 | 11,857 | 12,522 | 13,187 | 13,852 |
| Simi Valley | 33,110 | 34,052 | 35,346 | 39,182 | 41,776 | 43,302 | 44,828 | 46,354 | 47,880 |
| Thousand Oaks | 37,765 | 39,557 | 41,680 | 42,864 | 45,129 | 47,394 | 48,523 | 48,523 | 48,523 |
| Ventura | 37,346 | 37,985 | 39,124 | 39,766 | 41,370 | 42,975 | 44,579 | 46,184 | 47,789 |
| Incorporated Area Total | 198,315 | 205,283 | 212,733 | 225,852 | 240,458 | 253,947 | 266,083 | 275,807 | 285,531 |
| Unincorporated Area Total | 30,163 | 32,198 | 33,030 | 34,521 | 36,355 | 38,226 | 40,255 | 41,418 | 42,581 |
| COUNTYWIDE TOTAL | 228,478 | 237,481 | 245,763 | 260,373 | 276,813 | 292,173 | 306,338 | 317,225 | 328,112 |