S.D. Codified Laws § 23A-16-9 (2026)
When a public offense is committed on the boundary of two or more counties, or within five hundred yards thereof, the venue is in either county.
Source: SDC 1939 & Supp 1960, § 34.0804; SDCL, § 23-9-18; SL 1978, ch 178 , § 211.