U.S. Federal Route 45W is a north-south highway in Obion County. From the Gibson/Obion County Line to Union City this is a two-lane highway. From Union City to near South Fulton this is a controlled access highway. U.S. Rt. 45W passes through the following towns in Obion County. Kenton Union City U.S. Rt. 45W is multi-plexed in Obion County. Tennessee State Route 5, from the Gibson/Obion County Line to Union City. Tennessee State Route 21, from near Rives to Union City. Tennessee State Route 184, near Union City. U.S. Rt. 51, from near Union City to near South Fulton.