South Dakota Highway 391

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Highway 391
Route information
Maintained by SDDOT
Length	3.362 mi[1] (5.411 km)
Major junctions
South end	N-27 at the Nebraska state line southeast of Denby
North end	US 18 near Denby
Location
Country	United States
State	South Dakota
Counties	Oglala Lakota
Highway system
South Dakota State Trunk Highway System Interstate US State
← US 385 → SD 407

South Dakota Highway 391 (SD 391) is a 3.362-mile-long (5.411 km) state highway in the southwestern part of the U.S. state of South Dakota. It travels from Nebraska Highway 27 (N-27) at the Nebraska state line, southeast of Denby, to U.S. Route 18 (US 18) east-southeast of Denby. The highway is located entirely within Oglala Lakota County and in the Pine Ridge Indian Reservation. It is maintained by the South Dakota Department of Transportation (SDDOT), and is not part of the National Highway System.