— born in IL:
  2.  Thomas B. THOMPSON, b. 1820 
  3.  William THOMPSON, b. 1824, IL 
  4.  Peter THOMPSON, b. 18 Aug 1827, IL 
  5.  James THOMPSON, b. 1829, IL; m. 25 May 1867, Nancy A. BANDY

— born in Greene Co., IL:
  6.  Malinda THOMPSON, b. 1830/1; m. 6 Feb 1851, William BOAN [BONE? BOWEN?]
  7.  Preston B. THOMPSON, b. 3 Mar 1833 or 1831/2 
  8.  Perlina THOMPSON, b. 1834/5; m1. 14 Jul 1852, George Michael TAYLOR; m2. Mr. SMITH
  9.  Adaline THOMPSON, b. 17 Mar 1838, Roodhouse; d. 10 Dec 1921, Whitehall, Greene Co., IL; m. 19 Jul 1860, William MELLOR, s/o George MELLOR & Alice JACKSON
10.  Elizabeth THOMPSON, b. 1838/9; m. 1 Dec 1858, Uriah TAYLOR
11.  Diana THOMPSON, b. 1840/1; m. 26 Apr 1860, William SKILLENGER
12.  Warren THOMPSON, b. 1843/4

.  (daughter) THOMPSON, died in infancy
.  (daughter) THOMPSON, died in infancy

1.  Marriage Record:

2.  1820 Census Index/Images (online at Ancestry.com; Image #5 of 7; extracted by Diana Gale Matthiesen):¤

1820

IL

Washington Co.

Covington

Roll M33-12

p. 150

Ln. 36

John Thompson Jr.

100100-00100-0-100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	9 or under	1810-1820	= John W. (b. ca. 1815)
1 male	19-25*	1794-1801	= John (b. 1793)
1 female	16-25	1794-1804	= Mary (b. 1795)
1	person engaged in agriculture
*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."

3.  1830 Census Index (online at GenealogyLibrary.com):

Thompson, John

IL

Greene Co.

p. 10

4.  1840 Census Index (online at GenealogyLibrary.com):

Thompson, John

IL

Greene Co.

Wilmington Pct.

p. 118

5.  Census Microfilm Records:  Illinois, 1850 (Broderbund CD-301):  "Between Macoupin and Apple Creek," Greene Co., IL, p. 104, 1405/1418, enumerated 12 Dec 1850 (extracted by Diana Gale Matthiesen):

John Thompson, Jr.?	56	M	Farmer	3170	VA
Mary      "	52	F			KY
Peter     "	22	M	Farmer		IL
Malinda   "	19	F			"
Preston   "	18	M	Farmer		"
Perlina   "	15	F			"
Adeline   "	13	F			"
Elizabeth "	11	F			"
Diana     "	9	F			"
Warren    "	6	M			"
William Thompson	83	M			PA
Temperance  "	82	F			VA

The "Jr." is actually something of a blob; I think it's "Jr."  Is Mary fibbing about her age?  Said to be born 4 Jul 1795.  William & Temperance are obviously John's parents.

6.  1860 Census Images (online at Genealogy.com; Image #35-36 of 99):  Whitehall P.O., Greene Co., IL, Roll 178 (Book 1), pp. 642-643, PNs 46-47, 317/317, enumerated 22 Jun 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

John Thompson	67	M		Farmer	1400	600	Virginia
Mary Thompson	64	F					Tennessee
[next page]
Preston Thompson	27	M		Farm Laborer			Illinois
Perlina Taylor	25	F		Domestic			"
Adeline Thompson	21	F		"			"
Warren Thompson	14	M					"

Perlina appears to have been widowed (or divorced or deserted).  Living next to son, Thomas THOMPSON. 

7.  Richard Bandy, Sr., of Botetourt County, Virginia:  the First Two Generations [link died] by Frances Dumas.  Says Mary Bandy was born 4 Jul 1795 in VA.

8.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).

9.  Message in the Archives of the THOMPSON-L mailing list (online at RootsWeb.com).