U.S. Federal Route 275 runs north-south in Fremont County. It runs east of Interstate 29. This goes from the Iowa/Missouri State Line, south of Hamburg, to the Fremont/Mills County Line, in Tabor. U.S. Rt. 275 passes through the following towns in Fremont County. Hamburg Sidney
U.S. Rt. 275 is multi-plexed in Fremont County. Iowa State Route 2, from near Riverton to Sidney.