Missouri Secondary State Route UU is a short north-south highway in West-Central Macon County. It runs from U.S. Rt. 36 north into Rural Macon County. This is west of Callao. MO Sec St Rt UU does not pass through any towns in Macon County. MO Sec St Rt UU is not multi-plexed in Macon County. MO Sec St Rt UU intersects the following highwyas in Macon County. U.S. Rt. 36, near Callao.