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

Mann, Thomas

Jones, Elizabeth

29 Aug 1785

Lincoln Co.

1b.  D.L. Murray & N.R. Murray, compilers.  1995. Marriage Index: IL, IN, KY, OH, TN, 1720-1926.  Marriage data from the "Hunting for Bears" collection (Broderbund CD-2):

Mann, Francis	Jones, Elizabeth	29 Aug 1785	Lincoln Co., KY
Mann, Thomas	Jones, Elizabeth	29 Aug 1785	Lincoln Co., KY

1c.  Message #317 in the Mann Family Genealogy Forum at GenForum.

2.  1790/1800 Censuses.  Not available for VA, KY, or TN.

3a.  1810 Census.  The 1810 Census of TN was lost/destroyed, except for two counties, Rutherford and Grainger.

3b.  Census Index:  U.S. Selected Counties, 1810 (Broderbund CD-313):

1810

Mann, Thomas

TN

Stewart Co.

p. 18

500110-00210

To begin with, there is no extant 1810 Census for Stewart Co., TN.  In addition, please note the numerical data consist of six digits for males and five for females.  There is only one census year in which the digits for males and females were asymmetrical and that was 1820 when the digits were, indeed, 6/5.  Please compare this entry to the next one, both data and page number.  Clearly, there has been corruption of the Broderbund database and this record belongs in 1820.  Please see my further WARNINGS regarding use of this database.  For a description of the data on the Federal Census schedules, see What the Numbers in the Census Mean. 
There is no Thomas MANN in 1810 in this database who is obviously the one from Lincoln Co.

3c.  The census index online at Broderbund's GenealogyLibrary.com is the same one as on the Broderbund CD, so it, too, is flawed.

3d.  The census index online at Ancestry.com is similarly afflicted — they must have bought their data from the same flawed source.

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

1820

Mann, Thomas

TN

Stewart Co.

p. 18

500110-00210

This Thomas MANN, b. 1775-1794, is too young to be the Thomas MANN who is subject of this family group sheet, but given that I suspect these MANNs went to Stewart Co., TN, could this Thomas MANN be the son or nephew of the Thomas MANN who married Elizabeth JONES in 1785?  Otherwise, there is no Thomas MANN in this database in 1820 who is obviously the one from Lincoln Co.

5a.  A.B. Willhite.   [n.d.]  Christian Co., Kentucky, Tax List, 1810-1813.   (Self-published; available from author at 4396 Coopertown Rd., Russellville, KY 42276, or from the Christian County Genealogical Society, Hopkinsville, KY).  Not found.

5b.  A.B. Willhite.   [n.d.]  Christian Co., Kentucky, Tax List, 1814-1818.   (Self-published; this book is out of print; I do not have a copy.  If you have one to sell, please contact me.)

5c.  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
41	1819	Thos	Mann	1	-	-	1	-	-
-	1820-23	-	-	-	-	-	-	-	-
Legend for numerical data: A = White Males 21 or over; B = Blacks over 16; C = Total Blacks; D = Horses

Hard to say who this man might be, but given the lack of an earlier appearance, I do not believe he is the subject of this family group sheet.  I suspect he may be a nephew.  His disappearance in 1820 suggests he was living in Todd Co.

6.  Willard Rouse Jillson.  1925.  The Kentucky Land Grants. 2 vols.  Filson Club Publ., Louisville, KY (online at Ancestry.com):  No Thomas MANN appears in the grants before 1865.

7.  LDS.  Ancestral File and IGI (online).  The IGI has the marriage record; that's all as of 1 Nov 1999.