List of Interstate Highways in South Dakota
# List of Interstate Highways in South Dakota

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 |
| - | - | - | - | - | - | - |
| 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 |
