27th Regiment, Ohio Infantry
The 27th Regiment, Ohio Infantry mustered in July 15-August 18, 1861 at Camp Chase, Columbus, Ohio. They were mustered out July 11, 1865 at Louisville, Kentucky. 
For more information on the history of 27th Ohio Infantry see the following:
- Larry Stevens' Ohio in the Civil War, 27th Ohio Infantry
- The Civil War Archive section, 27th Regiment Infantry, (accessed 30 August 2012).
- The wikipedia article, 27th Ohio Infantry (accessed 16 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.
Companies by County:
Company A - see Roster
Company B - see Roster
Company D - see Roster
Company E - see Roster
Company F - see Roster
The above Company rosters are 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 266-300.
- 27th Ohio Regiment Infantry, Civil War Index, which includes history, battles, and roster with name, rank, age, date entered service, period of service and remarks.
- 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.
- Smith, Charles H. The history of Fuller's Ohio brigade, 1861-1865 : its great march, with roster, portraits, battle maps, and biographies. (Washington [District of Columbia] : Filmed by the Library of Congress Photoduplication Service, 1988) FHL Film 1550204
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 6 December 2010).
- E. M. P. Brister, Centennial history of the City of Newark and Licking County, Ohio (Defiance, Ohio: Hubbard Company for the Licking County Genealogical Society, 1982). p. 213
- History of Cuyahoga County, Ohio page 102
- History of Higland County Ohio page 141
- Allen County Historical Society, History of Allen County, p. 323. https://familysearch.org/search/catalog/317779?availability=Family%20History%20Library
- History of Clermont County, Ohio, (Philadelphia, Pa.: L.H. Everts, 1880), page 207
-  "History of Clermont and Brown Counties, Ohio: from the earliest historical times down to the present", by Byron Williams, (Tucson, Arizona: Filmed by W.C. Cox Co., 1974), page 426.