1820 Census
Ferguson            James                    IN    Washington; No Twp Listed
Ferguson            Jesse                    IN    Washington; No Twp Listed
1850 Census
Ferguson     Ann E           21  IN      IN      Washington; Brown
Ferguson     Isabela         56  SC      IN      Washington; Brown
Ferguson     Isabell Jane    27  IN      IN      Washington; Brown
Ferguson     Margaret        32  SC      IN      Washington; Brown
Ferguson     Samuel          16  IN      IN      Washington; Brown
Ferguson     Thomas          15  IN      IN      Washington; Brown
Fergerson    Asa             22  IN      IN      Washington; Martinsburg
Fergerson    Elize J         14  IN      IN      Washington; Posey
Fergerson    James H         37  IN      IN      Washington; Posey
Fergerson    Margaret N      10          IN      Washington; Posey
Fergerson    Mary A          32  PA      IN      Washington; Posey
Fergerson    Mary Louisa     5           IN      Washington; Posey
Fergerson    Robt alxr       7           IN      Washington; Posey
Fergerson    Sarah F         12          IN      Washington; Posey
1860 Census
Ferguson     Isabella        67  Female  Sc     IN      Washington Brown Twp
Ferguson     Samuel          25  Male    In     IN      Washington Brown Twp
Ferguson     William A       31  Male    In     IN      Washington Jackson Twp
1870 Census
Furgeson     M               55  Female  Sc     IN      Washington Brown Twp
Ferguson     Asa W           42  Male    In     IN      Washington Jackson Twp
1900 Census
Fergerson       Anna             72  Female  In      IN      Washington Brown Twp
Furgeson        John             31  Male    In      IN      Washington Vernon Twp
Ferguson        Nellie E         40  Female  Ky      IN      Washington Washington Twp
1920 Census
Furguson        Rachael          64  Female  In      IN      Washington Salem; Washington Twp
The 1830 Census was copied from two sources; Accelerated Indexing Systems International, Inc and the INDIANA Historical Society.  Many spellings of the FERGUSON surname and different numbers, one may be the page number of  the census and one may be the household number.  As this is an index, the original census should be consulted.

IN 1830-Washington Co
FERGESON            JAMES                       WASH              286
FERGESON            JAMES                       WASH              299
FERGESON            JAMES                       WASH              570
FERGUSON            JAMES                       WASH              596
FERGESON            JESSE                       WASH              303
FERGUSON            JESSE                       WASH              604
FERGESON            STEWARD                     WASH              314
FERGUSON            STEWARD                     WASH              626
FERGESON            WILLIAM S                   WASH              304
FERGUSON            WM S                        WASH              606

IN - 1840 Census - Washington Co
Information from the IN Historical Society
FORGUSON            Isabela        Wash                350
FERGASON            James          Wash                366
FERGASON            Curry          Wash                281

IN 1850 CENSUS - WASHINGTON
SOURCE:ACCELERATED INDEXING SYSTEMS INTERNATIONAL, INC.
FERGUSON            JAMES P        WASH         243
FERGUSON            SAMUEL         WASH         252