New Castle Zip Codes - Rockingham County NH

New Castle, NH Zip Code Map

New Castle, NH is a city located in Rockingham County, New Hampshire and has a land area of 0.81 square miles (2.10 km2). The water area for the city is 1.46 square miles or 3.78 km2. There is one unique zip code in New Castle, New Hampshire and it is 03854. The area code(s) for New Castle is 603.

Zip Codes for New Castle, NH (1)
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03854 New Castle Rockingham

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