27th Regiment, Illinois Infantry
The 27th regiment, Illinois Infantry was organized at Camp Butler, Illinois, August 10, 1861. At Jacksonville, Illinois It was ordered to Springfield, Illinois, August 25 and mustered out September 20, 1864. 
Companies in this Regiment with 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.
- Civil War Soldiers and Sailors System, (accessed 30 Dec. 2010) can be searched by soldier's name or by regiment; includes regimental rosters and additional history of the regiment.
- Illinois Civil War Rosters from the Adjutant General's Report, 27th Regiment (accessed 10 May 2011) includes rosters of all the regiments and information on the different companies in each regiment.
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 10 May 2011).