| Todd County (A8204, A2281) | Redistricting | 10-26-78 |
| Shannon and Todd Counties (7X-0149) | H.B. No. 1197 (1979) (Chapter 45) "Unorganized Counties Act"--severance of Tripp County from Todd County and Fall River County from Shannon County | 10-22-79 Declaratory judgment granted in part, and denied in part, by Consent Decree in South Dakota v. United States, No. 80-1976 (D.D.C. Dec. 1, 1981) |
| Shannon and Todd Counties (94-4477) | S.B. No. 17, Chapter 107 (1994)--voter removal procedures insofar as they incorporate the failure to vote within a four-year period as a trigger for mailing a registration confirmation notice | 6-19-95 Withdrawn 11-5-96 |
| Charles Mix County (2007-6012) (pdf) | Referendum on the increase of county commissioners from three to five members and the 2007 redistricting plan | 2-11-08 |