8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Santa Maria | 1 | 111,737 | 109,782 | 0.35% | 4,899 | 23 | City |
| Santa Barbara | 2 | 86,921 | 88,768 | -0.42% | 4,460 | 19 | City |
| Lompoc | 3 | 43,444 | 44,193 | -0.34% | 3,738 | 12 | City |
| Goleta | 4 | 32,573 | 32,762 | -0.12% | 4,148 | 8 | City |
| Carpinteria | 5 | 12,784 | 13,242 | -0.71% | 4,940 | 3 | City |
| Guadalupe | 6 | 8,862 | 8,226 | 1.45% | 6,765 | 1 | City |
| Solvang | 7 | 5,957 | 6,111 | -0.52% | 2,456 | 2 | City |
| Buellton | 8 | 4,988 | 5,162 | -0.7% | 3,153 | 2 | City |
Santa Maria is the largest city in Santa Barbara County, with a population of 111,737.
Buellton is the smallest city in Santa Barbara County, with a population of 4,988.
There are 8 cities in Santa Barbara County, California.