24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Santa Maria | 1 | 110,123 | 109,782 | 0.06% | 4,828 | 23 | City |
| Santa Barbara | 2 | 84,990 | 88,762 | -0.88% | 4,361 | 19 | City |
| Lompoc | 3 | 42,140 | 44,402 | -1.06% | 3,626 | 12 | City |
| Eastern Goleta Valley | 4 | 36,954 | 29,823 | 7.14% | 2,228 | 17 | CDP |
| Goleta | 5 | 32,599 | 32,764 | -0.1% | 4,152 | 8 | City |
| Orcutt | 6 | 31,695 | 31,353 | 0.59% | 2,929 | 11 | CDP |
| University California-Santa Barbara | 7 | 14,301 | 11,671 | 7.14% | 11,001 | 1 | CDP |
| Isla Vista | 8 | 12,628 | 15,733 | -5.24% | 22,918 | 1 | CDP |
| Carpinteria | 9 | 12,550 | 13,244 | -1.1% | 4,849 | 3 | City |
| Guadalupe | 10 | 8,890 | 8,219 | 1.53% | 6,786 | 1 | City |
| Montecito | 11 | 8,420 | 8,210 | -0.43% | 917 | 9 | CDP |
| Vandenberg Village | 12 | 6,753 | 7,945 | 0.25% | 1,281 | 5 | CDP |
| Solvang | 13 | 5,875 | 6,112 | -0.79% | 2,423 | 2 | City |
| Buellton | 14 | 4,876 | 5,160 | -1.16% | 3,082 | 2 | City |
| Santa Ynez | 15 | 4,790 | 4,728 | 0.5% | 992 | 5 | CDP |
| Vandenberg AFB | 16 | 3,767 | 3,646 | 0.78% | 168 | 22 | CDP |
| Mission Canyon | 17 | 2,530 | 2,649 | 0.4% | 1,399 | 2 | CDP |
| Toro Canyon | 18 | 1,738 | 1,918 | 0.87% | 185 | 9 | CDP |
| Summerland | 19 | 1,230 | 745 | -1.2% | 880 | 1 | CDP |
| Los Olivos | 20 | 992 | 838 | -0.9% | 379 | 3 | CDP |
| Ballard | 21 | 784 | 764 | 2.75% | 281 | 3 | CDP |
| New Cuyama | 22 | 707 | 550 | 1.87% | 1,119 | 1 | CDP |
| Los Alamos | 23 | 570 | 1,275 | -13.37% | 631 | 1 | CDP |
| Casmalia | 24 | 46 | 88 | -11.54% | 274 | 0 | CDP |
Santa Maria is the largest city in Santa Barbara County, with a population of 110,123.
Casmalia is the smallest city in Santa Barbara County, with a population of 46.
There are 24 cities in Santa Barbara County, California.