1900 Census
Ferguson        David            41  Male    Wi      SD      Lawrence 2-Wd Deadwood
Farguson        Archie           45  Male    Cana    SD      Lawrence 2-Wd Lead
Fargason        Mary             50  Female  Norw    SD      Lawrence 3-Wd Lead
Fergason        Carmalete        4   Female  Ia      SD      Lawrence 4-Wd Deadwood
Ferguson        Andrew D         43  Male    Mi      SD      Lawrence 4-Wd Lead
1910 Census
Ferguson        William          27  Male    Sd      SD      Lawrence 1-Wd Lead
Ferguson        Andrew           53  Male    Mi      SD      Lawrence 2-Wd Lead
Ferguson        Archie           45  Male    Pa      SD      Lawrence 4-Wd Lead
Ferguson        Will             26  Male    Sd      SD      Lawrence 6-Wd Lead
1920 Census
Ferguson        William A        35  Male    Oh      SD      Lawrence 1-Wd; Lead
Ferguson        Kathryn          21  Female  Sd      SD      Lawrence 1-Wd; Spearfish
Ferguson        Andrew D         62  Male    Mi      SD      Lawrence 2-Wd; Lead
Ferguson        Verna            19  Female  Sd      SD      Lawrence 4-Wd; Deadwood