Tennessee County Map with Interstate You Belong Here Anderson CountyBlount CountyGrainger CountyJefferson CountyKnox CountyLoudon CountyRoane CountySevier CountyUnion County Union County Total population 19,802 Children < 18 22.5% Rural population 100.0% More information about Union County Union County CountyLearn about Union CountyLearn about Union County UT Extension NeighborhoodsLearn about neighborhoods in Union County Leisure ActivitiesUnion County Recreation and Arts SchoolsUnion County school system Area Information * WeatherRealtorsCost of LivingImmigration and Citizenship Area Rentals * ZillowFor RentHomes for Rent *Listing links does not imply endorsement Visit Knoxville Guide Visit UT Knoxville Tennessee County Profiles UT Off Campus Housing