Hardin County Kentucky real estate information is updated daily from the Heart of Kentucky MLS. Hardin County is located south of Louisville Kentucky and recently topped one hundred thousand in population after the 2010 national census. Hardin County selected Elizabethtown as the county seat long ago since the county was formed in the 1790’s. Radcliff and the Fort Knox Army complex are also located in Hardin County Kentucky. Home prices are very affordable in the various communities mentioned above.