Missouri Secondary State Route OO is a short highway in Eastern Warren County. It runs from Missouri Secondary State Route N/T, at the St. Charles/Warren County Line, south of Foristell, to Missouri Secondary State Route M, southwest of Foristell. MO Sec St Rt OO does not pass through any towns in Warren County. MO Sec St Rt OO is not multi-plexed in Warren County. MO Sec St Rt OO intersects the following highways in Warren County. Missouri Secondary State Route N, near Foristell. Missouri Secondary State Route T, near Foristell. Missouri Secondary State Route M, near Foristell.
