1.  Illinois Statewide Marriage Index, 1763–1900:

Bayless, Rees

Thompson Matilda

Macoupin

05/14/1843

v. 2, p. ?

lic. #790

2.  AIS (Accelerated Index System) Census Index (online at Ancestry.com):  can't find in 1830.

3.  1840 Census Index/Images (online at Ancestry.com; Image #20 of 84; extracted by Diana Gale Matthiesen):

1840

IL

Macoupin Co.

pp. 35B-36A

Ln. 30

Rees Bayless

000 011 - 000 010

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	20-29	1810-1820	= brother? brother-in-law? boarder?
1 male	30-39	1800-1810	= Reese (b. 1805/6)
1 female	20-29	1810-1820	= sister? sister-in-law? boarder?
1	person employed in agriculture

The fact that there are no children in the household (and no children over 10 in 1850) and that I find no previous marriage for Reese in the above marriage database suggests that the woman in this household is not his wife, but possibly a sister, sister-in-law, boarder, etc.

4.  1850 Census Index/Images (online at Ancestry.com; Image #254 of 306 — indexed "Rees Bayles"):  Macoupin Co., IL, p. 305B, 3/3, enumerated 28 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Reese Bayles	44	M		Farmer	1560	Ten
Matilda Bayles	42	F				Ky
George Bayles	6	M				Ill
William Bayles	3	M				Ill
Amelia Bayles	73	F				Va
O G Smith	20	M		Labourer		Ohio

Amelia is Reese's widowed mother.

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