Whenever you see children in the LDS Ancestral File spaced an even two years apart, you know this is an automatic "fill-in" by the computer, not the real birth dates of the children.

1.  Jordan R. Dodd, ed.  1993.  Kentucky Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

Christman, Jacob

Hogg, Susan

Aug 20, 1820

Christian Co.

2a.  Census Index:  U.S. Selected Counties, 1820 (Broderbund CD-314):

1820

Chisman (sic), Jacob

KY

Christian Co.

p. 36

2b.  Christian County Genealogical Society (Hopkinsville, KY).  1995.  Christian County, KY, Census Records, 1820-1830-1840.  Simmons Historical Publ., Melber, KY.  On p. 11 (of the book, not the census):

1820

Chrisman

Jacob

000100-00100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	19-25*	1794-1801	= Jacob (b. 1799)
1 female	16-25	1794-1804	= Susan
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.  By subtracting the number in column three from the number in column four, you can create an age class "19-25."

As expected, the newlyweds have no children.  Living next door to Jacob's brother, Michael CHRISMAN. 

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

1830 State Census

Christman, Jacob

IL

Morgan Co.

p. 14

4.  Census Index:  U.S. Selected Counties, 1840 (Broderbund CD-316):  not found in IL.

5.  Census Index:  U.S. Selected Counties, 1850 (Broderbund CD-317):  not found in IL.

6.  A.B. Willhite.   [n.d.]  Christian Co., Kentucky, Tax List, 1819-1823.   (Self-published; available from author at 4396 Coopertown Rd., Russellville, KY 42276, or from the Christian County Genealogical Society, Hopkinsville, KY).

Pg. in Willhite	Year	First Name	Last  Name	A	B	C	D	Acres	Watercourse
15	1819	Jacob	Christman	1	-	-	2	-	-
-	1820	-	-	-	-	-	-	-	-
-	1821	-	-	-	-	-	-	-	-
170	1822	Jacob	Christman	-	-	-	2	-	-
214	1823	Jacob	Christman	1	-	-	1	-	-
Legend for numerical data: A = White Males 21 or over; B = Blacks over 16; C = Total Blacks; D = Horses

7.  James Taylor Killebrew.  1999.  County Court Order Book "F," Parts 1 & 2 [but not 3], Christian County, Kentucky, for the years 1819-1825.  County Genealogical Society (1101 Bethel St., Hopkinsville, KY 42240).  First column is the page number in Killebrew; second column is the page number in Court Order Book F.

p.	p.	Date	Motions
380	363	8 Mar 1825	Ordered that John Chrisman be appointed Surveyor of that part of the road leading from Hopkinsville to Williamson's Mill Commencing at Francis Boyds and continuing to John Keys and that the following hands be alloted to work on said part of said road, to wit:  David Clark 1 hand, John Chrisman 1 hand, Peter Chrisman (1), George Chrisman (1), Luton Lewis (1), William Underwood (1), Samuel Underwood (1), James Knight (1), John Knight (1), Jacob Chrisman (1), George Chrisman, Jr. (1), William Long (1), Thomas Long (1), James Johnston, Robt. Philps (1), Joshua Bryant (1), Lawrence Bryant (1) Andrew Maun [sic, Mann] (1), William Brawnon (1), John Keys (2) hands.

8.  LDS.  Family Search: Internet Genealogy Service: Ancestral File (AF).