South Dakota's 1st congressional district

When South Dakota was admitted into the Union in 1889, it was allocated two congressional seats, both of which were elected state-wide at-large.

This continued until South Dakota received a third congressional seat after the 1910 census, and individual districts were established.

From 1913 until 1933, the newly created 1st District covered 21 counties in southeastern South Dakota, including the state's largest city Sioux Falls.

[2] Population changes eventually reduced the district size until it again covered just 21 counties in the eastern part of the state.

During the 97th Congress, it included the cities of Aberdeen, Brookings, Sioux Falls, Watertown, Vermillion, and Yankton.