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U.S. ZIP Codes Database 2026

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Rensselaer County ZIP Codes

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

County State ZIP Code City Area Codes
Rensselaer County NY 12089 Hoosick 518
Rensselaer County NY 12090 Hoosick Falls 518, 802, 838
Rensselaer County NY 12094 Johnsonville 518, 838
Rensselaer County NY 12121 Melrose 518, 838
Rensselaer County NY 12123 Nassau 518, 838
Rensselaer County NY 12133 North Hoosick 518
Rensselaer County NY 12138 Petersburg 413, 518, 802, 838
Rensselaer County NY 12140 Poestenkill 518, 838
Rensselaer County NY 12144 Rensselaer 518, 838
Rensselaer County NY 12153 Sand Lake 518, 838
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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.