US 40 highlighted in red | ||||
Route information | ||||
Maintained by MoDOT | ||||
Existed | 1926–present | |||
Major junctions | ||||
West end | ![]() ![]() ![]() ![]() | |||
East end | ![]() ![]() ![]() | |||
Location | ||||
Country | United States | |||
State | Missouri | |||
Counties | Jackson, Lafayette, Saline, Cooper, Howard, Boone, Callaway, Montgomery, Warren, St. Charles, St. Louis, City of St. Louis | |||
Highway system | ||||
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U.S. Route 40 (US 40) in the state of Missouri is a U.S. highway that runs from Kansas City to St. Louis. Outside of Greater St. Louis, much of the route either parallels or runs along I-70. East of Wentzville in Greater St. Louis, the route runs along I-64.
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