I can't find them in TX in 1880 in the transcribed census on CD. I'm suspicious about a few H. Marcums but the age and wife aren't right. There are no Henry Marcums of that age in the national index. There is an H.F. in Twin Branches, Lawrence Kentucky, 16 year old wife Sarah, children Izelia, Alles, Hurley, Henry. i didn't copy it because the wife seemed too young.