Missouri Secondary State Route AA is a north, south, east, and west highway in Southwestern Monroe County. This runs from U.S. Rt. 24, near Madison, to Missouri State Route 15, south of Paris. MO Sec St Rt AA does not pass through any towns in Monroe County. MO Sec St Rt AA is multi-plexed in Monroe County. Missouri Secondary State Route C, near Holliday. MO Sec St Rt AA intersects the following highways in Monroe County. U.S. Rt. 24, near Madison.