Missouri State Route 124 is one of the main east-west highway in Northern Boone County. It goes from the Boone/Howard County Line, near Harrisburg, to it's eastern end point in Centralia. MO St Rt 124 passes through the following towns in Boone County. Harrisburg
Hallsville
Centralia
MO St Rt 124 is multi-plexed in Boone County. U.S. Rt. 63, near Hallsville.
EB MO St Rt 124 at Harrisburg. EB MO St Rt 124 east of MO Sec St Rt E. EB MO St Rt 124 east of MO Sec St Rt NN. EB MO St Rt 124 west of U.S. Rt. 63. A junction marker on SB U.S. Rt. 63. WB MO St Rt 124 near Hallsville. WB MO St Rt 124 south of Centralia. A junction marker on EB MO St Rt 22.