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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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 11788 Hauppauge 631, 934
Suffolk County NY 11789 Sound Beach 631, 934
Suffolk County NY 11790 Stony Brook 631, 934
Suffolk County NY 11792 Wading River 631, 934
Suffolk County NY 11794 Stony Brook 631, 934
Suffolk County NY 11795 West Islip 631, 934
Suffolk County NY 11796 West Sayville 631, 934
Suffolk County NY 11798 Wyandanch 631, 934
Suffolk County NY 11901 Riverhead 631, 934
Suffolk County NY 11930 Amagansett 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.