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Your Ad Here Lamar County, Georgia Lamar County is a county located in the U.S. state of Georgia. The 2005 Census Estimate shows a population of 16,378. The county seat is Barnesville. History The Georgia General Assembly proposed the constitutional amendment to create the county on August 17, 1920, and the citizens of the state voted in favor of the amendment on November 2, 1920. Lamar County was named after Lucius Quintus Cincinnatus Lamar II, was an American politician and jurist from Mississippi. ![]() |