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 91754 Monterey Park Los Angeles County 213, 323, 626
CA 91755 Monterey Park Los Angeles County 213, 323, 626
CA 91756 Monterey Park Los Angeles County 626
CA 91758 Ontario San Bernardino County 951, 909
CA 91759 Mt Baldy San Bernardino County 626, 661, 840, 909
CA 91761 Ontario San Bernardino County 840, 909, 951
CA 91762 Ontario San Bernardino County 840, 909
CA 91763 Montclair San Bernardino County 840, 909
CA 91764 Ontario San Bernardino County 840, 909
CA 91765 Diamond Bar Los Angeles County 562, 657, 714, 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.