Seymour is a census-designated place (CDP) and unincorporated community in Blount and Sevier counties in the U.S. state of Tennessee.The first court of Sevier County, State of Franklin, was held at Newell's Station in March 1785.[8] The Trundles Crossroads Post Office changed its name soon afterwards to reflect the community's designation.[9] On multiple occasions, residents have met to discuss the possibility of incorporating as a town or city.The community is situated in a rolling valley where the foothills of the Great Smoky Mountains give way to the Ridge-and-Valley Appalachians.[12] Chapman Highway (part of U.S. Route 441) traverses Seymour, connecting the community with Knoxville to the northwest.