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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Nassau County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Nassau County.

County State ZIP Code City Area Codes
Nassau County NY 11737 Farmingdale 516, 631
Nassau County NY 11753 Jericho 363, 516
Nassau County NY 11756 Levittown 363, 516
Nassau County NY 11758 Massapequa 363, 516, 631, 934
Nassau County NY 11762 Massapequa Park 363, 516
Nassau County NY 11765 Mill Neck 363, 516
Nassau County NY 11771 Oyster Bay 363, 516
Nassau County NY 11773 Melville 516
Nassau County NY 11774 Farmingdale 516
Nassau County NY 11783 Seaford 363, 516
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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.