91st Regiment, Illinois Infantry
The 91st Regiment, Illinois Infantry was organized at Camp Butler, Illinois, and mustered in September 8, 1862. It Mustered out July 12 and discharged at Chicago, Illinois, July 28, 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.