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

Clark, Thomas	Jones, Polly	24 Feb 1804	Albemarle Co.
-	-	-	-
Thurston, James A.	Clarke, Mary Jane	10 Oct 1842	Albemarle Co.

2a.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

Thomas Sr. Clarke Birth: About 1784, Virginia; Death: 06 Jul 1864, Albemarle, Virginia Marriage: 17 Feb 1803, Albemarle, Virginia Spouse: Mary or Polly Jones Source: patron submission

All born in Albemarle, Virginia. David H. CLARKE; Birth: 27 Nov 1804 William CLARKE; Birth: About 1807 John CLARKE; Birth: About 1808 Thomas CLARKE; Birth: About 1810 Elizabeth CLARKE; Birth: About 1813; Death: 1843, Albemarle, Virginia James Henry CLARKE; Birth: 22 Sep 1816 Mary J. CLARKE; Birth: About 1820 Sarah CLARKE; Birth: About 1821 Sidney M. CLARKE [M]; Birth: About 1823 George M. CLARKE; Birth: 24 Nov 1826 Father: Thomas Sr. CLARKE; Mother: Mary or Polly JONES Source: patron submissions

2b.  LDS.  Family Search: Internet Genealogy Service: Pedigree Resource File (index to CDs, online at FamilySearch.org).

Thomas Mason CLARK Birth: 1773, of Culpeper, Virginia; Death: 6 Jul 1864, Albemarle, Virginia Father: James CLARK; Mother: Mary MARSTON Marriage: 17 Feb 1803, Albemarle, Virginia Spouse: Mary JONES Birth: abt 1777, of Charlotte, Virginia Marriage: 23 Aug 1813, Orange, Virginia Spouse: Catherine Robertson JAMESON Birth: abt. 1792, of Culpeper, Virginia; Death: 29 Oct 1870 Source: Robert EZELL, of Farmington, UT

Two different Thomas CLARKs are being mixed up here.

All born in Albemarle, Virginia. David H. CLARKE; Birth: 27 Nov 1804 William CLARKE; Birth: abt 1807 John CLARKE; Birth: abt 1808 Thomas CLARKE; Birth: abt 1810 Elizabeth CLARKE; Birth: abt 1813; Death: 1843/50, Albemarle, Virginia James Henry CLARKE; Birth: 22 Sep 1816 Mary J. CLARKE; Birth: abt 1820 Sarah CLARKE; Birth: abt 1821 Sidney M. CLARKE [M]; Birth: abt 1823 George M. CLARKE; Birth: 24 Nov 1826 Father: Thomas CLARKE Sr; Mother: Mary "Polly" JONES Source: Elaine Marie Via BOUSCHER of Lacey, WA

James Henry CLARKE Birth: 22 Sep 1816, Albemarle Co., Virginia; Death: 30 Nov 1895, Fairfax, Fairfax, Virginia Source: Karen CONWAY of Concord, NC

2.  1810

3.  1820

4.  1830 Census Index/Images (online at Ancestry.com, Image #25-26 of 150 — list was roughly alphabetized; extracted by Diana Gale Matthiesen):

1830

VA

Albemarle Co.

Roll 197

p. 239

Ln. 1

Thomas Clarke

101 130 100 - 012 100 100

no slaves

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1825-1830	= George (b. 1826)
1 male	10-14	1815-1820	= James (b. 1816)
1 male	15-19	1810-1815	= Thomas (b. 1810/1)
3 males	20-29	1800-1810	= John (b. ca. 1808) = William (b. ca. 1807) = David (b. 1804)
1 male	40-49	1780-1790	= Thomas (b. 1783/4)
1 female	5-9	1820-1825
2 females	10-14	1815-1820	= Sarah (b. 1819/20) = Mary J.
1 female	15-19	1810-1815	= Elizabeth (b. ca. 1813)
1 female	40-49	1780-1790	= Mary (b. 1785/6)

5.  1840 Census Index/Images (online at Ancestry.com, Image #11 of 67 — list was roughly alphabetized; extracted by Diana Gale Matthiesen):

1840

VA

Albemarle Co.

Fredericksville Parish

Roll 549

pp. 101B-102A

Ln. 2

Thos Clark Sr

001 010 010 - 000 300 010

010000-000000

0400000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 white male	10-14	1825-1830	= George (b. 1826)
1 white male	20-29	1810-1820	= James (b. 1816)
1 white male	50-59	1780-1790	= Thomas (b. 1783/4)
3 white females	15-19	1820-1825	=  =  = Sarah (b. 1819/20) = Mary J. (b. 1815-20)
1 white female	50-59	1780-1790	= Mary (b. 1785/6)
1 male slave	10-23	1816-1830	= ?
4	persons employed in agriculture

6.  1850 Census Every-Name-Index/Images (online at Ancestry.com, Image #96 of 261):  Albemarle Co., VA, Roll M432_932, p. 218A, 909/909, enumerated 9 Sep 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Thomas Clark	66	M		Farmer	1200
Mary     "	64	F
George   "	24	M
Francis  "	26	F
Nancy    "	4	F
James R  "	2	M
George E "	1	M

Frances is George's wife, and the children are theirs.

7.  1860 Census Every-Name-Index/Images (online at Ancestry.com, Image #109 of 160):  Charlottsville P.O.,Fredericksville Parish, Albemarle Co., VA, Roll M653_1331, pp. 465-466, PN 109-110, 764/751, enumerated 23 Aug 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Thos Clark	74	M		Farmer		600	Va
Mary   "	72	F					"
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G M Clark	34	M		Farmer	4575	3800	Va
F R    "	38	F					"
N F    "	14	F					"
Jas    "	12	M					"
Geo E  "	10	M					"
M J     "	8	F					"
Nimrod   "	6	M					"
Elizabeth "	4	F					"
David     "	2	M					"
Sally Watson	38	F				50	"
M A     "	10	F					"
W A     "	8	F					"

G.M. is their married son, George; Sally is their widowed daughter (she was age 30 in 1850).  Listed next to married son, Thos. CLARK (æ 49, b. VA) and his family.