1850 Census
Furguson     John            33  KY      IN      Knox; Subdivision 61
Furguson     John            81  NJ      IN      Knox; Subdivision 61
Furguson     Martha          23  IA      IN      Knox; Subdivision 61
Furguson     Mary            3   IA      IN      Knox; Subdivision 61
Furguson     Mary            66  VA      IN      Knox; Subdivision 61
Furguson     Sarah E         2   IA      IN      Knox; Subdivision 61
Furgason     Mary J          25  IA      IN      Knox; Vincennes
1860 Census
Furguson     Robert          23  Male    Irel   IN      Knox Vincennes
Furguson     Martha A        33  Female  In     IN      Knox Widener Twp
1870 Census
Furgeson     George          29  Male    In     IN      Knox Johnson Twp
Furgeson     Joseph W        35  Male    In     IN      Knox Johnson Twp
Ferguson     Joshua          43  Male    Oh     IN      Knox Vincennes Twp
Ferguson     Robert          32  Male    Irel   IN      Knox Washington Twp
Ferguson     Margaret        18  Female  In     IN      Knox Widner Twp
1900 Census
Furgeson        Thedore          28  Male    Oh      IN      Knox 5-Wd Vincennes
Fergnson        Elizah           57  Male    In      IN      Knox 6-Wd Vincennes
Ferguson        Joseph D         35  Male    In      IN      Knox Busseron Twp
Ferguson        James M          41  Male    In      IN      Knox Harrison Twp
Ferguson        George           27  Male    In      IN      Knox Johnson Twp
Ferguson        W H              52  Male    In      IN      Knox Johnson Twp
Ferguson        Zachariah        32  Male    In      IN      Knox Johnson Twp
Ferguson        Guy              9   Male    In      IN      Knox Vincennes
Ferguson        James            38  Male    In      IN      Knox Washington Pct
Ferguson        John             45  Male    ??      IN      Knox Widner Twp
1910 Census
Furguson        Nellie           62  Female  Il      IN      Knox 1-Wd Vincennes
Furguson        Theodore         36  Male    Il      IN      Knox 5-Wd Vincennes
Ferguson        George           57  Male    Oh      IN      Knox 6-Wd Vincennes
Furguson        Bert W           25  Male    In      IN      Knox 6-Wd Vincennes
Furgerson       Walter           30  Male    Ky      IN      Knox Busseron Twp
Ferguson        John W           31  Male    In      IN      Knox Decker Twp
Farguson        Charles F        30  Male    In      IN      Knox Johnson twp
Ferguson        George           36  Male    In      IN      Knox Johnson Twp
Ferguson        Zach A           42  Male    In      IN      Knox Johnson Twp
Ferguson        Herbert          29  Male    In      IN      Knox Vigo Twp
Ferguson        James            46  Male    In      IN      Knox Washington Twp
Ferguson        Albert           36  Male    In      IN      Knox Widner Twp
Ferguson        Joseph           44  Male    In      IN      Knox Widner Twp
1920 Census
Fergerson       Charles          28  Male    In      IN      Knox 2-Wd; Bicknell; Vigo Twp
Ferguson        David            21  Male    Ky      IN      Knox 2-Wd; Bicknell; Vigo Twp
Ferguson        William S        37  Male    In      IN      Knox 3-Wd; Bicknell; Vigo Twp
Fergeson        James            22  Male    In      IN      Knox 3-Wd; Bicknell; Washington Twp
Fergeson        William          36  Male    In      IN      Knox Sandborn; Vigo Twp
Ferguson        Theo             46  Male    In      IN      Knox Vincennes Twp
Ferguson        Charles          40  Male    In      IN      Knox Vincennes; Vincennes Twp
Ferguson        Eliga            79  Male    Us      IN      Knox Vincennes; Vincennes Twp
Ferguson        John             43  Male    In      IN      Knox Vincennes; Vincennes Twp
Ferguson        Levi D           59  Male    In      IN      Knox Vincennes; Vincennes Twp
Ferguson        Zachary          52  Male    In      IN      Knox Vincennes; Vincennes Twp
Ferguson        Elmer            40  Male    In      IN      Knox Washington Twp
Ferguson        Floyd            23  Male    In      IN      Knox Washington Twp
Ferguson        James            45  Male    In      IN      Knox Washington Twp
Ferguson        Joseph D         53  Male    In      IN      Knox 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-Knox Co
FURGUSON            JOHN                        KNOX              249
FERGUSON            JOHN                        KNOX              496
FURGUSON            THOMAS                      KNOX              248
FERGUSON            THOMAS                      KNOX              494

IN - 1840 Census - Knox Co
Information from the IN Historical Society
FURGERSON           William        Knox                141
FURGERSON           John           Knox                 91

IN 1850 CENSUS - KNOX
SOURCE:ACCELERATED INDEXING SYSTEMS INTERNATIONAL, INC.
FURGASON            MARY J         KNOX         252
FURGUSON            JOHN           KNOX         282
FURGUSON            JOHN           KNOX         282