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
State directory

California ZIP Codes

Complete postal directory, details, and geographic map for the State of California.

State ZIP Code City County Area Codes
CA 94511 Bethel Island Contra Costa County 925
CA 94512 Birds Landing Solano County 707
CA 94513 Brentwood Contra Costa County 209, 350, 925
CA 94514 Byron Contra Costa County 209, 350, 925
CA 94515 Calistoga Napa County 707
CA 94516 Canyon Contra Costa County 341, 510, 925
CA 94517 Clayton Contra Costa County 925
CA 94518 Concord Contra Costa County 925
CA 94519 Concord Contra Costa County 925
CA 94520 Concord Contra Costa County 925
Page 172 of 266

Geographic Map of California

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.