It should be noted that if your ancestor is not listed in the roster, it does not mean that he did not serve. The roster is only about 1/4 of the men who actually served. There is no one complete source, unfortunately. Other state sources are Grave Registration file cards and company election lists, as well as other miscellaneous sources. The election lists are at the OH Historical Soc, as are the Grave Reg files for the entire state (duplicates of county ones). I haven't used them in Jackson co, but if they are still in the county, they should be in the Recorders Office. Of course, you can also send to the National Archives for pension/bounty land applications, even if you don't have a specific company or regiment of service.