Missouri State Route 231 is a north-south highway in Southeastern St. Louis County. It runs from the St. Louis City Limits to the St. Louis/Jefferson County Line, at the Meramec River. MO St Rt 231 does not pass through any towns in St. Louis County. MO St Rt 231 is not multi-plexed in St. Louis County. MO St Rt 366 intersects the following highways in St. Louis County. Interstate 255, near Green Park. U.S. Rt. 50, near Green Park.
A BGS on EB I-255/U.S. Rt. 50. A BGS on EB I-255. A BGS on EB I-255. A BGS on WB I-255/U.S. Rt. 50. SB MO St Rt 231 at I-255/U.S. Rt. 50. SB MO St Rt 231 south of I-255/U.S. Rt. 50. SB MO St Rt 231 in South St. Louis County. SB MO St Rt 231 near the St. Louis/Jefferson County. NB MO St Rt 231 at the St. Louis/Jefferson County Line.
