High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Rutherford County is a county located in the U.S. state of Tennessee. As of 2000, the population was 182,023. By 2009, the population was estimated at 255,239, making Rutherford County the fastest-growing county in Tennessee. Its county seat is Murfreesboro, which is also the geographic center of Tennessee, as well as the center of population of Tennessee. The county is included in the Nashville-Davidson Murfreesboro Franklin Metropolitan Statistical Area.