Monroe, Belmont, Licking, Guernsey, Noble and a couple of other counties have a pretty good amount of Henthorns. I have most of them hand copied from the 1840, 1850, 1860, and 1880 censes. My mother has hand copied some more from the 1850 census (except she's going page by page as listed in the index). We're trying from our end to find your Nathan...we found two possibles but we still think they are only possibilities. I'll let you know!