South Dakota Highway 105

South Dakota Highway 105 (SD 105) was a state highway located entirely in Union County, in the eastern part of the U.S. state of South Dakota.^[1] It traveled from Military Road in North Sioux City to Interstate 29 (I-29) in Jefferson. It was an alternate route to I-29.^[2]

Highway 105
SD 105 highlighted in red
Route information
Existed	c. 1980–1998
Major junctions
South end	I-29 at North Sioux City
North end	I-29 at Jefferson
Location
Country	United States
State	South Dakota
Highway system
South Dakota State Trunk Highway System Interstate US State

Major intersections

The entire route was in Union County.

Location	mi	km	Destinations	Notes
North Sioux City	0.0	0.0	I-29 – Sioux City, Elk Point	exit 2
	1.0	1.6	Military Way	Former US 77
Jefferson	8.8	14.2	I-29 – Elk Point, Sioux City	exit 9
1.000 mi = 1.609 km; 1.000 km = 0.621 mi