Alton Bay, NH is a city located in Belknap County, New Hampshire and has a land area of 23.58 square miles (61.07 km2). The water area for the city is 18.64 square miles or 48.28 km2. There is one unique zip code in Alton Bay, New Hampshire and it is 03810. The area code(s) for Alton Bay is 603.
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