San Luis Obispo County, California
County seat: San Luis Obispo · Population 282,367 (2025) · 3,301 sq mi
San Luis Obispo County is the 24th most populous of California's 58 counties, with 282,367 people (2025 estimate). Its county seat is San Luis Obispo. The map shows its 7 cities and towns and the 4 neighboring counties.
San Luis Obispo County facts
- County seat
- San Luis Obispo
- Population (2025 estimate)
- 282,367 −0% since 2020
- Land area
- 3,301 sq mi 16th largest of 58
- Water area
- 315 sq mi
- Population density
- 86 per sq mi
- Established
- 1850
- Named after
- San Luis Obispo county seat of San Luis Obispo County, California, United States
- Largest city
- San Luis Obispo 50,636
- Median household income
- $97,446
- Cities and towns
- 7 plus 23 CDPs
- ZIP codes
- 30
- Time zone
- Pacific
- FIPS code
- 06079
Cities and towns in San Luis Obispo County
San Luis Obispo County has 7 incorporated cities, towns and villages. Populations count the people living inside San Luis Obispo County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| San Luis Obispo (county seat) | City | 50,636 | |
| Paso Robles | City | 31,626 | |
| Atascadero | City | 29,464 | |
| Arroyo Grande | City | 18,123 | |
| Grover Beach | City | 12,456 | |
| Morro Bay | City | 10,613 | |
| Pismo Beach | City | 7,911 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Nipomo | 17,516 | |
| Los Osos | 14,166 | |
| Templeton | 9,580 | |
| California Polytechnic State University | 7,915 | |
| Oceano | 7,128 | |
| Cambria | 5,978 | |
| Lake Nacimiento | 3,339 | |
| San Miguel | 3,227 | |
| Cayucos | 2,427 | |
| Callender | 2,230 | |
| Woodlands | 2,061 | |
| Los Ranchos | 1,467 | |
| Avila Beach | 1,303 | |
| Shandon | 1,169 | |
| Santa Margarita | 1,149 | |
| Blacklake | 983 | |
| Edna | 330 | |
| Whitley Gardens | 244 | |
| Garden Farms | 241 | |
| San Simeon | 217 | |
| Los Berros | 145 | |
| Oak Shores | 128 | |
| Creston | 0 |
ZIP codes in San Luis Obispo County
30 ZIP codes reach into San Luis Obispo County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 93252 also Ventura, Kern and Santa Barbara counties
- 93254 also Santa Barbara County
- 93401
- 93402
- 93405
- 93407
- 93408
- 93409
- 93410
- 93420
- 93422
- 93424
- 93426 also Monterey County
- 93428
- 93430
- 93432
- 93433
- 93434 also Santa Barbara County
- 93442
- 93444
- 93445
- 93446
- 93449
- 93451 also Monterey County
- 93452
- 93453
- 93454 also Santa Barbara County
- 93458 also Santa Barbara County
- 93461 also Kern County
- 93465
Population of San Luis Obispo County, 2020–2025
San Luis Obispo County shrank by 73 people (−0%) between April 2020 and July 2025: 1,008 more deaths than births and a net gain of 808 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 282,257 |
| 2021 | 279,839 |
| 2022 | 282,747 |
| 2023 | 282,225 |
| 2024 | 282,153 |
| 2025 | 282,367 |
Neighboring counties
- Santa Barbara County south · 442,065 people
- Kern County east · 927,068 people
- Monterey County northwest · 433,729 people
- Kings County northeast · 154,327 people
Printable San Luis Obispo County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (168 KB)
- PNG (2400 px) (95 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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