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.

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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 11561 Long Beach 363, 516
Nassau County NY 11563 Lynbrook 363, 516
Nassau County NY 11565 Malverne 363, 516
Nassau County NY 11566 Merrick 363, 516
Nassau County NY 11568 Old Westbury 363, 516
Nassau County NY 11569 Point Lookout 363, 516
Nassau County NY 11570 Rockville Centre 363, 516
Nassau County NY 11571 Rockville Centre 516
Nassau County NY 11572 Oceanside 363, 516
Nassau County NY 11575 Roosevelt 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.