S.D. Codified Laws § 9-3-20 (2026)
The validity of the incorporation of any municipality may only be challenged in an action or proceeding instituted by or on behalf of the state.
Source: PolC 1877, ch 24, § 53; CL 1887, § 1078; RPolC 1903, § 1467; RC 1919, § 6159; SDC 1939, § 45.0111; SL 2024, ch 28 , § 32.