Fleming is an unincorporated community in Liberty County, Georgia, United States. The community is 10.2 miles east-northeast of Hinesville. A post office at Fleming was established in 1869 and remained in operation until March 9, 2013; it still has its ZIP code, 31309. As of the United States Census 2010, the population of the 31309 ZIP Code Tabulation Area …Fleming is an unincorporated community in Liberty County, Georgia, United States. The community is 10.2 miles east-northeast of Hinesville. A post office at Fleming was established in 1869 and remained in operation until March 9, 2013; it still has its ZIP code, 31309. As of the United States Census 2010, the population of the 31309 ZIP Code Tabulation Area was 1,210.