Missouri Secondary State Route M runs east-west in Southwestern Boone County. It goes from Ashland to Wilton. MO Sec St Rt M passes through the following towns in Boone County. Ashland
Wilton MO Sec St Rt M is not multi-plexed in Boone County. MO Sec St Rt M intersects the following highways in Boone County. U.S. Rt. 63, at Ashland.