1900 Census Ferguson William T 25 Male Wi IA Humboldt Grove Twp 1910 Census Ferguson ??? 24 Female Ia IA Humboldt Grove Twp 1920 Census Fegurson Charles S 49 Male WI IA Humboldt Livermore; Humboldt Ferguson Howard C 56 Male In IA Humboldt Livermore; Humboldt Fergeson John W 57 Male In IA Humboldt Pioneer; Weaver