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South Dakota's state highways were assigned in a numbering pattern that followed that of the U.S. Highways followed upon their inception. East–west highways carried even numbers and increased from North to South – while north–south highways carried odd numbers and increased from east to west. This holds true only for two-digit highways.
Map showing the interstates and primary highways in South Dakota. South Dakota has a total of 83,609 miles (134,556 km) of highways, roads, and streets, along with 679 miles (1,093 km) of interstate highways. [1] South Dakota and Montana are the only states sharing a land border which is not traversed by a paved road.
Sioux Falls, with a population of just over 184,000 in 2019, is the largest city in South Dakota. South Dakota is relatively notable for its lack of large urban centers. Sioux Falls, the largest city in the state, only ranks as the 135th largest in the country, [74] and the state's third-largest city, Aberdeen, has a population of less than 25,000.
South Dakota has 83,609 miles (134,556 km) of highways, roads, and streets, along with 679 miles (1,093 km) of interstate highways. [142] Two major interstates pass through South Dakota: Interstate 90 , which runs east and west through the southern half of the state; and Interstate 29 , running north and south in the eastern portion of the state.
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I-29 / US 81 at the North Dakota state line north-northwest of Victor: 1958: 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 ...
South Dakota highways are generally state-maintained. Highway names; Interstates: Interstate X (I-X) ... US 12 at Big Stone City: 1926: current US 14: 439.75: 707.71
Once the southern portion of the Dakota Territory, South Dakota became a state on November 2, 1889, simultaneously with North Dakota. Pierre is the state capital and Sioux Falls , with a population of 159,000, is South Dakota's most populous city .