List of former state highways in South Dakota

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Standard South Dakota highway shields
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 following is a list of former state highways in South Dakota. These roads are now either parts of other routes or no longer carry a route number.