Roundhead, OH is a city located in Hardin County, Ohio and has a land area of 1.07 square miles (2.77 km2). The water area for the city is 0.00 square miles or 0.00 km2. There is one unique zip code in Roundhead, Ohio and it is 43346. The area code(s) for Roundhead is 326/419/567/937.
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