Missouri Route 340

State highway in eastern Missouri

Route 340 also called Clarkson Road or Olive Boulevard is a highway in the St. Louis metropolitan area. Its western terminus is Route 100 in Ellisville, and its eastern terminus is at an intersection with Ferguson Avenue and Olive Boulevard in University City. The stretch of Route 340 between Manchester Road and the Interstate 64 / U.S. 40 / U.S. 61 interchange is known locally as Clarkson Road. The remainder of Route 340 between this intersection and its eastern terminus is variously known as Olive Boulevard. Route 340 ends at Ferguson Avenue in University City, but Olive Boulevard continues to Skinker Boulevard on the St. Louis city line.

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