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Lamar County is a county located in the U.S. state of Mississippi. It is part of the Hattiesburg, Mississippi Metropolitan Statistical Area. As of 2010, the population was 55,658. Its county seat is Purvis.
Named for the post-Civil War Mississippi statesman Lucius Quintus Cincinnatus Lamar, the county was carved out of Marion County to the west in 1904. It is largely a rural county, except for its northeast quarter, which is within the Hattiesburg metropolitan area.