Missouri Secondary State Route O is north-south highway in Central Macon County. It runs from U.S. Rt. 36/Missouri Secondary State Route C, near Bevier, to Missouri Secondary State Route C, near Elmer. This runs near Long Branch State Park, and Long Branch Lake. MO Sec St Rt O does not pass through any towns in Macon County. MO Sec St Rt O is not multi-plexed in Macon County. MO Sec St Rt O intersect the following highways in Macon County. U.S. Rt. 36, near Bevier.