At http://www.rootsweb.com/~tnclaib2/index.htmlhttp://www.rootsweb.com/~tnclaib2/index.html, Leon Meyers provides superb indices linked to scanned images of pages from the1840, 1850, and 1860 cenuses of Claiborne Co., TN. He also provides indices to the 1870 and 1880 censuses but these are not linked to scanned page images.
In 1860, Martin Carmack's family (#438) is listed just after the household of his father Levi (#437).
Levi is not indexed in the 1850 Claiborne Co. census, but is in the 1840 census. Where was Levi (and Martin) in 1850?