1840 Census
Ferguson            John                     MD    Carroll; District 2
1850 Census
Ferguson     John M          63  MD      MD      Carroll; Uniontown
Ferguson     Margaret S      30  MD      MD      Carroll; Uniontown
Ferguson     Sarah D         33  MD      MD      Carroll; Uniontown
1860 Census
Furguson     John M          75  Male    Md     MD      Carroll Union P O
1870 Census
Fergueson    William M       20  Male    Md     MD      Carroll Hampstead Dist
Ferguson     S D             50  Female  Md     MD      Carroll Uniontown P O
1910 Census
Ferguson        William J        39  Male    Md      MD      Carroll 5-Dist
Ferguson        William H        48  Male    Ny      MD      Carroll 7-Dist
Ferguson        Uriah            63  Male    Md      MD      Carroll Uniontown
1920 Census
Fergerson       Margeret E       29  Female  Md      MD      Carroll Sykesville 5-Dist
1930 Census
Ferguson        Anna K           62  Female  PA      MD      Carroll Springfield State Hospital
Ferguson        Annie            32  Female  MD      MD      Carroll Springfield State Hospital

Carroll County Maryland Census for 1850
Ferguson , John M. 235 Union Town