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 95397 Modesto Stanislaus County 209
CA 95401 Santa Rosa Sonoma County 707
CA 95402 Santa Rosa Sonoma County 707
CA 95403 Santa Rosa Sonoma County 707
CA 95404 Santa Rosa Sonoma County 707
CA 95405 Santa Rosa Sonoma County 707
CA 95406 Santa Rosa Sonoma County 707
CA 95407 Santa Rosa Sonoma County 707
CA 95409 Santa Rosa Sonoma County 707
CA 95410 Albion Mendocino County 707
Page 216 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.