1910 Census
Fergeson        William H        36  Male    Mt      MT      Rosebud Crow Indian Reservation
Fergusen        William J        43  Male    Il      MT      Rosebud Kirby School Dist
Ferguson        Rob A            24  Male    Ia      MT      Rosebud Sanders School Dist
1920 Census
Ferguson        Park             46  Male    Mo      MT      Rosebud 1-Wd; Forsyth
Ferguson        Glen             18  Male    Il      MT      Rosebud School Dist 13
Ferguson        Sidney B         22  Male    Il      MT      Rosebud School Dist 13