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;

Mainline highways


Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed
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


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