1850 Census
Ferguson     Hannah          40  NC      IN      Union; Brownsville
Fergerson    James           20  IN      IN      Union; Brownsville
Ferguson     Josiah          19  IN      IN      Union; Brownsville
Ferguson     Mary            14  IN      IN      Union; Brownsville
Ferguson     William         17  IN      IN      Union; Brownsville
Ferguson     James M         7   IL      IN      Union; Harmony
Ferguson     Leadam          3   IN      IN      Union; Harmony
Ferguson     Mary            66  VA      IN      Union; Harmony
Ferguson     Sarah           25  IN      IN      Union; Harmony
Ferguson     Zacheriah       27  IN      IN      Union; Harmony
Ferguson     Elizabeth       41  MD      IN      Union; Liberty
Ferguson     Jno             71  MD      IN      Union; Liberty
Ferguson     Martha E        1   IN      IN      Union; Liberty
Ferguson     Sarah E         4   IN      IN      Union; Liberty
1860 Census
Ferguson     William         27  Male    In     IN      Union Brownsville
Ferguson     Cyntha          50  Female  Oh     IN      Union Harmony Twp
Ferguson     James           30  Male    In     IN      Union Harmony Twp
1870 Census
Fergeson     Hugh            65  Male    Oh     IN      Union Liberty Twp
1900 Census
Ferguson        Nancy            57  Female  In      IN      Union Harmony 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-Union Co
FURGUSON            GEORGE                      UNIO              243
FERGUSON            GEORGE                      UNIO              484
FURGUSON            ISAAC                       UNIO              243
FERGUSON            ISAAC                       UNIO              484
FURGUSON            JOHN                        UNIO              245
FERGUSON            JOHN                        UNIO              488
FERGUSON            LEDUM                       UNIO              484
FURGUSON            LEDURN                      UNIO              243
FURGUSON            MOSES                       UNIO              245
FERGUSON            MOSES                       UNIO              488
FURGUSON            THOMAS                      UNIO              243
FERGUSON            THOMAS                      UNIO              484
FURGUSON            WILLIAM                     UNIO              223
FURGUSON            WILLIAM                     UNIO              246
FERGUSON            WILLIAM                     UNIO              444
FERGUSON            WILLIAM                     UNIO              490
FURGUSON            ZACHARIAH                   UNIO              243
FERGUSON            ZACHARIAH                   UNIO              484

IN - 1840 Census - Union Co
Information from the IN Historical Society
FURGUSON            Isaac          Unio                543
FERGUSON            Zachariah      Unio                543
FORGUSON            Seadam         Unio                583

IN 1850 CENSUS - UNION
SOURCE:ACCELERATED INDEXING SYSTEMS INTERNATIONAL, INC.
FERGUSON            JOHN           UNIO         288
FERGUSON            MARY           UNIO         358
FERGUSON            WILLIAM        UNIO         295
FERGUSON            ZACHARIAH      UNIO         358
FURGUSON            JAMES          UNIO         308