The census description of the enumeration district is listed as "unorganized territory".Siem is not listed on the 1910 census.
1900 South Dakota, Butte County, Siem Precinct, ED#10, Page 149A, 6/18/1900:
Francis Robinson, head, 52yo, 3/1844, M/32yrs, Canada England England, Imm.1860, Naturalized, Stock Raiser
Alma S., wife, 53yo, 8/1846, M/32yrs, 5 children/5 living, VT NH VT
Emma C., daughter, 31yo, 1/1869, VT Can VT
Harry L. Miller, grandson, 6yo, 5/1894, SD IA VT
Louis Rickland*, s-i-l, 24yo, 12/1875, M/1yr, VT VT Can, Stock Raiser
Gracie L., daughter, 19yo, 5/1881, M/1yr, 0 children, VT Can VT, Dress Maker
Sanford Andersen, hired hand, 18yo, NC NC NC, Ranch Laborer
*Handwriting does look like Rickland but info matches Marjorie's parents on the 1910 census.