Plainfield is an unincorporated community in Dodge County, Georgia, United States. The community is located near Georgia State Route 117, 7.4 miles northeast of Eastman. The Town of Plainfield is a rural farming community in northeast Dodge County. A railroad station was established in Plainfield and began operation in 1909. The local train, Wrightsvill…Plainfield is an unincorporated community in Dodge County, Georgia, United States. The community is located near Georgia State Route 117, 7.4 miles northeast of Eastman. The Town of Plainfield is a rural farming community in northeast Dodge County. A railroad station was established in Plainfield and began operation in 1909. The local train, Wrightsville and Tennille Railroad, known as the "Wiggle and Twist" made a daily round-trip from Dublin through Rentz, Cadwell, and Plainfield on to Eastman.