I have seen his name, but do not have anything further yet. My plans are to try and connect the Halfhills. Therefore, I'm still doing research on the Halfhill's. My e-mail address has changed since my last post. It is now: firstname.lastname@example.org
I am the gr gr gr gr granddaughter of Absalom Halfhill who married Nancy Owen in 1827. They had only one son was John Jackson Halfhill 7-13-1832, they had 3 daughters: Polly (Mary)1829 she married Daniel Vandament in 1853, C. Ann 1830, and Hannah 1834 she married William Elliot 9-28-1854. I haven't found if C. Ann ever married or not.
I believe that the John Halfhill on the 1830 Ohio Census was Absalom's father, but haven't been able to prove that yet. If I keep working on it, I will some day.