105th Regiment, Ohio Infantry
The 105th Regiment was organized at Cleveland, Ohio and mustered in August 20, 1862. From March April 29-May 20, 1865, the regiment marched to Washington, D. C. and was mustered out June 3, 1865.
Wikipedia has additional history for the 105th Regiment.
Companies in 105th Regiment with the County of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.
The story of a thousand : being a history of the service of the 105th Ohio Volunteer Infantry, in the war for the union from August 21, 1862 to June 6, 1865, by Albion W. Tourgee (Buffalo [New York] : S. McGerald, 1896, 409, lxiv p. : ill., maps, ports.) Google book. FHL Collection book 977.1 M25t; film 874018 Item 2; fiche 6118259 (5 fiche)