43rd Regiment, Illinois Infantry
The 43rd Regiment, Illinois Infantry was organized at Camp Butler, Illinois, and mustered in October 12, 1861. It mustered out November 30 and discharged at Camp Butler, Illinois, December 14, 1865. 
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.
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 10 May 2011).