Dunbarton, NH is a city located in Merrimack County, New Hampshire and has a land area of 30.86 square miles (79.93 km2). The water area for the city is 0.46 square miles or 1.19 km2. There is one unique zip code in Dunbarton, New Hampshire and it is 03046. The area code(s) for Dunbarton is 603.
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