Minnesota State Highway 40

Trunk Highway 40 marker
Trunk Highway 40
Map
MN 40 highlighted in red
Route information
Maintained by MnDOT
Length72.723 mi (117.036 km)
Existed1933[citation needed]–present
Major junctions
West end SD 20 near Marietta, MN, and Revillo, SD
Major intersections US 75 at Madison
US 59 / MN 7 at Milan
East end CSAH 5 in Willmar
Location
CountryUnited States
StateMinnesota
CountiesLac qui Parle, Chippewa, Kandiyohi
Highway system
  • Minnesota Trunk Highway System
MN 39 MN 41

Minnesota State Highway 40 (MN 40) is a 72.723-mile-long (117.036 km) state highway in west-central Minnesota, which travels from South Dakota Highway 20 (SD 20) at the South Dakota state line near Marietta and continues east to its eastern terminus at its intersection with County State-Aid Highway 5 (CSAH 5) in Willmar.