San Luis Obispo County's 2026 population is estimated at 281,515, reflecting a -0.06% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). San Luis Obispo County is the 24th largest county in California. The 2010 population was 269,800 and has grown 4.34% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.4 years
Female: 42.3 years
Male: 38.9 years
There are 232,311 adults, (62,338 of whom are seniors) in San Luis Obispo County.
Female: 139,589 (49.6%)
Male: 141,966 (50.4%)
The racial composition of San Luis Obispo County includes 69.35% White, 7.67% other race, 3.72% Asian, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 195,251 | 69.35% |
| Two or more races | 47,929 | 17.02% |
| Other race | 21,592 | 7.67% |
| Asian | 10,471 | 3.72% |
| Black or African American | 3,267 | 1.16% |
| Native American | 2,632 | 0.93% |
| Native Hawaiian or Pacific Islander | 413 | 0.15% |
San Luis Obispo County 's average per capita income is $56,484. Household income levels show a median of $97,446. The poverty rate stands at 12.91%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $135,532 | $175,674 |
| Families | $120,533 | $157,446 |
| Households | $97,446 | $131,990 |
| Non Families | $57,671 | $82,508 |
Average Income
Median Household Income
Poverty Rate