South Dakota Codified Laws 7-1-19. Day County boundaries
Beginning at a point where the township line between townships one hundred nineteen and one hundred twenty north intersects the range line between ranges fifty–two and fifty–three west, according to the survey of the former Sisseton and Wahpeton Indian Reservation, thence north and along said range line to the northeast corner of township one hundred twenty–four north of range fifty–three west, according to said survey; thence west and northwesterly along the township line between townships one hundred twenty–four and one hundred twenty–five north, across said former reservation in the same course, to the northwest corner of township one hundred twenty–four north of range fifty–nine west of the fifth principal meridian; thence south and along the eighth guide meridian west to the southwest corner of township one hundred twenty north of range fifty–nine west; thence east and along the township line between townships one hundred nineteen and one hundred twenty north, to the place of beginning.
Source: SL 1879, ch 12; SL 1883, ch 30; SL 1885 (SS), ch 12, § 2; SL 1889, ch 55, § 2; SL 1891, ch 42; SDC 1939, § 12.0120.