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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Suffolk County ZIP Codes

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

County State ZIP Code City Area Codes
Suffolk County NY 11775 Melville 631
Suffolk County NY 11776 Port Jefferson Station 631, 934
Suffolk County NY 11777 Port Jefferson 631, 934
Suffolk County NY 11778 Rocky Point 631, 934
Suffolk County NY 11779 Ronkonkoma 631, 934
Suffolk County NY 11780 Saint James 631, 934
Suffolk County NY 11782 Sayville 631, 934
Suffolk County NY 11784 Selden 631, 934
Suffolk County NY 11786 Shoreham 631, 934
Suffolk County NY 11787 Smithtown 631, 934
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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.