1820 census: Census day was the first Monday in August.

Billings, Abraham, Jr. KY Muhlenberg Co., page 141 000100 00100 >blank except farmer. over 18 to 26, wife between 16 & 26
So this could be correct for this Abraham and Frances Wood who’s marriage was in June of 1820.

Billings, Abrham, KY Muhlenberg Co., page 137

Billings, Arden, KY Muhlenberg Co., page 137 210001 22010 >blank except farmer. over 45, wife between 26 & 45

Biggerstaff, Thomas, KY Muhlenberg Co., page 135 in 1820

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Abraham is not listed with this group in 1830 These are the names of the father and 2 brothers
1830 Census,
Billings, Abram Saverton Twp, Ralls Co., MO - page 355
1 male of 60 & under 70, 1female of 15 & under twenty & 1 female of 60 & under 70.
Billings, George Saverton Twp, Ralls Co., MO - page 354
1boy and 1girl under the age of 5, and what appears to be he and his wife both between 20 & 30.
Billings, John Saverton Twp, Ralls Co., MO - page 354
2 boys under 5 and John= over 30, probable wife under 30.

1840 IL, Pike Co., No Township listed page 134

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Genweb
http://searches.rootsweb.com/usgenweb/archives/ky/...rriages/various2.txt
Muhlenberg County, KY - Marriages: Book One, Continued
494) JUNE 22, 1821 ABRAHAM BILLINGS & FRANCES MOORE
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Ancestry.com
database Kentucky Marriages to 1850:
Billins, Abraham Jr. married Wood, Frances on 22 Jun 1820 in Muhlenberg County, Kentucky