Decatur County is located in West Tennessee, one of the states Three Grand Divisions. It is bordered on the north by Carroll County and Benton County, on the west by Henderson County, on the south by Hardin County, and on the east by the Tennessee River. Decatur County was created by dividing Perry County along the line of the Tennessee River in November, 1845, and adding a parcel along the western boundary from Henderson County, this to take effect 1846 Mar 1. The county was named for Commodore Stephen Decatur, officer in the War of 1812. The county seat is Decaturville.
