Fredericktown, OH is a city located in Knox County, Ohio and has a land area of 109.96 square miles (284.80 km2). The water area for the city is 1.36 square miles or 3.52 km2. There is one unique zip code in Fredericktown, Ohio and it is 43019. The area code(s) for Fredericktown is 740/419/567.
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