Chillicothe, OH is a city located in Ross County, Ohio and has a land area of 348.73 square miles (903.21 km2). The water area for the city is 3.28 square miles or 8.50 km2. There is one unique zip code in Chillicothe, Ohio and it is 45601. The area code(s) for Chillicothe is 740.
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