1840 Census
Ferguson            James                 IA Terr. Johnson; no twp listed
1860 Census
Furgurson    William         59  Male    Oh     IA      Johnson Oxford Twp
1870 Census
Ferguson     Levi P          50  Male    Ky     IA      Johnson Big Grove Twp
Ferguson     Charles         56  Male    Ct     IA      Johnson Oxford Twp
1900 Census
Furgerson       Minnie E         16  Female  Pa      IA      Johnson 4-Wd Iowa
1920 Census
Furgeson        John             26  Male    Tn      IA      Johnson Scott