I recently purchased some books from the Coles County Illinois Genealogical Society.
You may already have this information, but in "Early Marriages Coles County Il. 1831-1850" there is, on page 34:
Martin, George - Rachel Decker -11 May (1843)- William Stewart JP.
In the U.S. Federal Census Coles County Illinois - Published by the Coles County Gen. Society - on page 245, in Mattoon Township:
NameAge, Sex, Prof., Birthplace,Property - Real, Pers.
Martin, George,40, M, Farmer,Ky,2500200
I hope this is of some help to you.