Decatur County is a county located in the U.S. state of Tennessee. As of the 2020 census, the population was 11,435. Its county seat is Decaturville. This county is named after naval hero Stephen Decatur, Jr., who gained national recognition in the First Barbary War, the Second Barbary War, and the War of 1812 by his leadership and achievemen…Decatur County is a county located in the U.S. state of Tennessee. As of the 2020 census, the population was 11,435. Its county seat is Decaturville. This county is named after naval hero Stephen Decatur, Jr., who gained national recognition in the First Barbary War, the Second Barbary War, and the War of 1812 by his leadership and achievements at sea. The county was created in November 1845 from the part of Perry County west of the Tennessee River in response to a petition by citizens on the west side of the river.
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