South Dakota Highway 105
# 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. It traveled from Military Road in North Sioux City to Interstate 29 (I-29) in Jefferson. It was an alternate route to I-29.

## 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 | |
| North Sioux City | 1.0 | 1.6 | Military Way | Former US 77 |
| Jefferson | 8.8 | 14.2 | I-29 – Elk Point, Sioux City | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi |||||
