Missouri Secondary State Route MM runs east-west between Gray Summit and Labadie. It runs from Missouri State Route 100 to Missouri Secondary State Route T.
A junction marker on EB MO St Rt 100. A guide marker on EB MO St Rt 100. WB MO Sec St Rt MM in Gray Summit. A junction marker on WB MO Sec St Rt T. A guide marker on WB MO Sec St Rt T.
