List of Interstate Highways in South Dakota

Standard South Dakota highway shields
Interstate Highways highlighted in red
System information
Notes	South Dakota highways are generally state-maintained.
Highway names
Interstates	Interstate X (I-X)
US Highways	U.S. Highway X (US X)
State	(State) Highway X (SD X)
System links
South Dakota State Trunk Highway System Interstate US State

The Interstate Highways in South Dakota are the segments of the Dwight D. Eisenhower National System of Interstate and Defense Highways owned and maintained by the South Dakota Department of Transportation in the US state of South Dakota.

Mainline highways

Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-29	252.50	406.36	I-29 at the Iowa state line at Dakota Dunes	I-29 / US 81 at the North Dakota state line north-northwest of Victor	01958-01-011958	current
I-90	412.76	664.27	I-90 at the Wyoming state line west-northwest of North Spearfish	I-90 at the Minnesota state line north-northeast of Valley Springs	—	—
I-190	1.72	2.77	US 16 / SD 44 / West Boulevard in Rapid City	I-90 / US 14 / US 16 / SD 79 in Rapid City	01962-01-011962	current
I-229	11.33	18.23	I-29 in Sioux Falls	I-90 / CR 125 north of Sioux Falls	01966-01-011966	current

Business routes

Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-29 BL	—	—	—	—	—	—	Serves Elk Point
I-29 BS	—	—	—	—	—	—	Serves Sioux Falls
I-29 BS	—	—	—	—	—	—	Serves Brookings
I-90 BL	—	—	—	—	—	—	Serves Spearfish
I-90 BL	—	—	—	—	—	—	Serves Sturgis
I-90 BL	—	—	—	—	—	—	Serves Rapid City
I-90 BL	—	—	—	—	—	—	Serves Wall
I-90 BL	—	—	—	—	—	—	Serves Kadoka
I-90 BL	—	—	—	—	—	—	Serves Murdo
I-90 BL	—	—	—	—	—	—	Serves Presho
I-90 BL	—	—	—	—	—	—	Serves Chamberlain
I-90 BL	—	—	—	—	—	—	Serves Mitchell
I-90 BS	—	—	—	—	—	—	Serves Sioux Falls
I-229 Dwtn.	—	—	—	—	—	—	Serves Sioux Falls

External links

• Media related to List of Interstate Highways in South Dakota at Wikimedia Commons