U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
All states and U.S. territories
Maps and coordinates
County directory

San Luis Obispo County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in San Luis Obispo County.

County State ZIP Code City Area Codes
San Luis Obispo County CA 93420 Arroyo Grande 805, 820
San Luis Obispo County CA 93421 Arroyo Grande 805
San Luis Obispo County CA 93422 Atascadero 805, 820
San Luis Obispo County CA 93423 Atascadero 805
San Luis Obispo County CA 93424 Avila Beach 805, 820
San Luis Obispo County CA 93428 Cambria 805, 820
San Luis Obispo County CA 93430 Cayucos 805, 820
San Luis Obispo County CA 93432 Creston 805, 820
San Luis Obispo County CA 93433 Grover Beach 805, 820
San Luis Obispo County CA 93435 Harmony 805
Page 2 of 4

Geographic Map of San Luis Obispo County

Postal context

About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.