U.S. Federal Route 51 runs north-south across Mc Lean County. This is one of the counties that U.S. Rt. 51 has a spur in. Around Bloomington and north of Normal, U.S. Rt. 51 is on interstate standard highway. South of Bloomington, the route is slowly being upgraded to interstate standards in hopes that Interstate 39 will be extended southward. U.S. Rt. 51 passes through the following towns in Mc Lean County. Normal
U.S. Rt. 51 is multi-plexed several times in Mc Lean County Interstate 39, from the Woodford/Mc Lean County Line to Interstate 55 at Normal.
Interstate 55, from Interstate 39 in Normal to Veterans Parkway in Bloomington.