. "2010Z"^^ . . "18317"^^ . "5.95697e+06"^^ . "38.6102"^^ . . . . "Lamar County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 18,317. The county seat is Barnesville.Lamar County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area."@en . . "4.76558e+08"^^ . "1.3"^^ . "Lamar County"@en . "4.81738e+08"^^ .