1.   Marriage Record:

2.  1790 Census

3.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312).  Please see my WARNING regarding use of this database (the numerical data have the genders switched). 

1800

Dean, Jacob

PA

Huntingdon Co.

p. 147

12111-0200100

These data should read:

02001-12111-00

Which indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
2 males	10-15	1784-1790	=  =
1 male	45 or over	in or bef. 1755	= Jacob
1 female	9 or under	1790-1800	=
2 females	10-15	1784-1790	= Sarah (b. 1788) =
1 female	16-25	1774-1784	=
1 female	26-44	1755-1774	=
1 female	45 or over	in or bef. 1755	= Nancy (b. 1756)

Zacharia has left the nest.  Nancy must be fibbing about her age.

4.  Census Index:  U.S. Selected Counties, 1810 (Broderbund CD-313):

1810

Dean, E.

PA

Huntingdon Co.

Union Twp.

p. 9

Also living in Union Twp.:  E. DEAN, L. DEAN, and Z. DEAN.

5.  Census Index:  U.S. Selected Counties, 1820 (Broderbund CD-314):

1820

Dean, Enoch

PA

Huntingdon Co.

Union Twp.

p. 41

Also living in Union Twp.:  Enoch DEAN.

6.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):

1830

Dean, Enoch

PA

Huntingdon Co.

Union Twp.

p. 15

Also living in Union Twp.:  Enoch DEAN.

7.  LDS.  Family Search: Internet Genealogy Service: International Genealogical Index (IGI).

Enoche DEAN Will: 13 Feb 1831, Huntingdon, Pennsylvania Father: Jacob DEAN Source:  patron submitted form

Presumably, the will is Jacob's.

8.  WorldConnect (online at RootsWeb.com).

9.  LDS.  Family Search: Internet Genealogy Service: Ancestral File (AF) and International Genealogical Index (IGI).