There is an Aaron Huffman listedin the 1830 census for Ross County, Ohio page 278 in Greenfield Twp. Also listed is William Huffman on pg.279. However, I see no listing of a Conrad in the index. I have not seen the actual census record though, pehaps he might be listed there. I am searching for Joseph H.W. Huffman of Greenfield Twp., Ross Cty, Ohio. If you should happen across him, I would appreciate a "heads up". Thanks and Lots of Luck!