Cornish Flat, NH is a city located in Sullivan County, New Hampshire and has a land area of 0.00 square miles (0.00 km2). The water area for the city is 0.00 square miles or 0.00 km2. There is one unique zip code in Cornish Flat, New Hampshire and it is 03746. The area code(s) for Cornish Flat is 603.
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