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
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California ZIP Codes

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

State ZIP Code City County Area Codes
CA 91016 Monrovia Los Angeles County 626, 747, 818
CA 91017 Monrovia Los Angeles County 626
CA 91020 Montrose Los Angeles County 747, 818
CA 91021 Montrose Los Angeles County 818
CA 91023 Mount Wilson Los Angeles County 747, 818
CA 91024 Sierra Madre Los Angeles County 626, 747, 818
CA 91025 Sierra Madre Los Angeles County 626
CA 91030 South Pasadena Los Angeles County 213, 323, 626
CA 91031 South Pasadena Los Angeles County 626
CA 91040 Sunland Los Angeles County 747, 818
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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.