21st Regiment, Ohio Infantry
The 21st Regiment, Ohio Infantry mustered in September 19, 1861 at Findlay, Ohio. They were mustered out July 25, 1865 at Louisville, Kentucky. 
For more information on the history of 21st Ohio Infantry see the following:
- The Civil War Archive section, 21st Regiment Infantry (3 years), (accessed 30 August 2012).
- Larry Stevens' Ohio in the Civil War, 21st Ohio Infantry
- The wikipedia article, 21st Ohio Infantry (accessed 12 October 2011)
Companies in this Regiment with the Counties 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 above information about the counties is from Official Roster of the Soldiers of the State of Ohio in the War of the Rebellion, 1861-1866, vol. III, 21st-36th Regiments-Infantry, (Cincinnati, Ohio Valley Pub., 1886), pages 10-38. Internet Archive.
- Beginning United States Civil War Research gives steps for finding information about a Civil War soldier. It covers the major records that should be used. Additional records are described in ‘Ohio in the Civil War’ and ‘United States Civil War, 1861 to 1865’ (see below).
- National Park Service, The Civil War Soldiers and Sailors System, is searchable by soldier's name and state. It contains basic facts about soldiers on both sides of the Civil War, a list of regiments, descriptions of significant battles, sources of the information, and suggestions for where to find additional information.
- Ohio in the Civil War describes many Confederate and Union sources, specifically for Ohio, and how to find them.. These include compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- United States Civil War, 1861 to 1865 describes and explains United States and Confederate States records, rather than state records, and how to find them. These include veterans’ censuses, compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- Canfield, Silas S.History of the 21st regiment Ohio Volunteer Infantry in the war of the rebellion. (Columbus, Ohio : Ohio Historical Society, 1988) FHL Film 1688765 Item 5 and (Bethesda, Maryland : University Publications of America, c1993) FHL Fiche 6118171
- Culp, Edward C.The Twenty-fifth Ohio Veteran Volunteer Infantry in the war for the union. (Columbus, Ohio : Ohio Historical Society, 1988) FHL Film 1688765 Item 4
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 6 December 2010).