South Dakota Road Map

Written and Fact-checked by | Updated On: April 03, 2026 | 15:15 ET

South Dakota Road Map showing the state routes, US highways, interstate highways, major roads, local connecting Road, secondary Road, important local road of the South Dakota.

South Dakota Roads and Highways Map

Roads and Highways in South Dakota

South Dakota has a well-connected road network that supports agriculture, tourism, and regional travel across the Great Plains. Major interstate highways such as I-90 and I-29 connect key cities including Sioux Falls, Rapid City, and Aberdeen. U.S. and state highways extend across rural farmland, prairie regions, and scenic destinations like the Black Hills. These roads are essential for freight movement, tourism, and daily travel, ensuring reliable connectivity across South Dakota’s wide and open landscape.

Major Highways in South Dakota

HighwayTypeRoute DirectionConnects
I-90InterstateEast–WestSioux Falls, Rapid City
I-29InterstateNorth–SouthSioux Falls, Watertown
I-190InterstateNorth–SouthRapid City
I-229InterstateLoopSioux Falls
US 12U.S. HighwayEast–WestAberdeen, Mobridge
US 14U.S. HighwayEast–WestBrookings, Pierre
US 16U.S. HighwayEast–WestRapid City, Keystone
US 83U.S. HighwayNorth–SouthPierre, Mobridge
US 85U.S. HighwayNorth–SouthSpearfish, Belle Fourche
SD 44State HighwayEast–WestRapid City, Pierre
SD 50State HighwayEast–WestYankton, Vermillion
SD 34State HighwayEast–WestCentral South Dakota
SD 37State HighwayNorth–SouthMitchell, Huron

Interstate Highways in South Dakota

InterstateRoute DirectionKey Cities Connected
I-29North–SouthSioux Falls, Watertown
I-90East–WestSioux Falls, Rapid City
I-190North–SouthRapid City
I-229LoopSioux Falls

Road Network in South Dakota

South Dakota’s road network includes interstate highways for long-distance travel, U.S. highways connecting regional centers, and state highways serving rural communities. Local roads and farm routes provide access to agricultural areas, small towns, and tourist destinations, supporting both daily travel and economic activity.

Road TypeDescriptionApprox. Length
Interstate HighwaysHigh-speed corridors680 miles
U.S. HighwaysRegional connectors3,100 miles
State HighwaysStatewide routes8,500 miles
Local RoadsCity streets60,000+ miles
Rural RoadsFarm access50,000+ miles

South Dakota Roads & Highways Facts

StateSouth Dakota
Total Road Network122,000+ miles
Interstate Mileage680 miles
State Highway System8,500 miles
Total Lane Miles175,000+ miles
Major Interstate RoutesI-29, I-90
Key AuthoritySouth Dakota Department of Transportation
Number of Interstates4
Major UsesAgriculture, tourism
Urban Road NetworkLimited metro systems
Longest InterstateI-90
Longest U.S. HighwayUS 14