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 94063 Redwood City San Mateo County 650
CA 94064 Redwood City San Mateo County 650
CA 94065 Redwood City San Mateo County 650
CA 94066 San Bruno San Mateo County 650
CA 94070 San Carlos San Mateo County 650
CA 94074 San Gregorio San Mateo County 650
CA 94080 South San Francisco San Mateo County 415, 628, 650
CA 94083 South San Francisco San Mateo County 650
CA 94085 Sunnyvale Santa Clara County 408, 650, 669
CA 94086 Sunnyvale Santa Clara County 408, 650, 669
Page 156 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.