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 11726 Copiague 631, 934
Suffolk County NY 11727 Coram 631, 934
Suffolk County NY 11729 Deer Park 631, 934
Suffolk County NY 11730 East Islip 631, 934
Suffolk County NY 11731 East Northport 631, 934
Suffolk County NY 11733 East Setauket 631, 934
Suffolk County NY 11738 Farmingville 631, 934
Suffolk County NY 11739 Great River 631, 934
Suffolk County NY 11740 Greenlawn 631, 934
Suffolk County NY 11741 Holbrook 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.