1900 Census
Ferguson        J L              70  Male    Scot    CA      San Luis Obispo Arroyo Grande Twp
Ferguson        Archibald        53  Male    Scot    CA      San Luis Obispo Carpinteria
Ferguson        John             61  Male    Cana    CA      San Luis Obispo Cholame Twp
Furguson        Mary             50  Female  Cana    CA      San Luis Obispo Morro Twp
Fergason        Henry G          30  Male    Ca      CA      San Luis Obispo San Luis Obispo Twp
1910 Census
Ferguson        George           44  Male    Me      CA      San Luis Obispo Arroyo Grande Twp
Ferguson        Henry G          39  Male    Ca      CA      San Luis Obispo San Luis Obispo Twp
Ferguson        John W           71  Male    Cana    CA      San Luis Obispo San Luis Obispo Twp
Ferguson        Ida M            20  Female  Norw    CA      San Luis Obispo San Miguel Twp
1920 Census
Ferguson        F G              70  Male    Port    CA      San Luis Obispo Adelaida; Lynch
Ferguson        Joe C            65  Male    Port    CA      San Luis Obispo Klau; Las Tablas
Ferguson        Mary             71  Female  Ny      CA      San Luis Obispo San Luis Obispo