Decatur County was created from Early County on Dec. 8, 1823 by an act of the General Assembly. The county was organized by an act of Dec. 19, 1823. Georgia's 58th county was named for U.S. Navy Commodore Stephen Decatur. In 1920, Seminole County was created entirely from Decatur County. Also, portions of Decatur County were used to help create Thomas County (1825) and Grady County (1905).
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