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 91729 Rancho Cucamonga San Bernardino County 909
CA 91730 Rancho Cucamonga San Bernardino County 840, 909
CA 91731 El Monte Los Angeles County 626
CA 91732 El Monte Los Angeles County 626
CA 91733 South El Monte Los Angeles County 213, 323, 562, 626
CA 91734 El Monte Los Angeles County 626
CA 91735 El Monte Los Angeles County 626
CA 91737 Rancho Cucamonga San Bernardino County 840, 909
CA 91739 Rancho Cucamonga San Bernardino County 840, 909
CA 91740 Glendora Los Angeles County 626, 840, 909
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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.