Ohio is a town in Herkimer County, New York, United States. The population was 922 at the 2000 census. The town is named after the state of Ohio. The Town of Ohio is in the northwest part of the county and northeast of Utica. Part of Ohio is within the Adirondack Park. The Town of Ohio was established as the "Town of West Brunswick" in 1823 from part of the Town of Norway. The name changed to "Ohio" in 1836. Ohio was increased by some of the now defunct "Town of Wilmurt," which itself had been partly formed with territory from Ohio and the Town of Russia in 1836. Wilmurt was once the largest town in New York.