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91st Regiment Illinois Volunteer Infantry
Illinois state flag
Active September 8, 1862 to June 28, 1865
Country United States
Allegiance Union
Branch Infantry

The 91st Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.


The 91st Illinois Infantry was organized at Camp Butler, Illinois and mustered into Federal service on September 8, 1862.

The regiment was mustered out on June 12, 1865 and discharged at Chicago, Illinois on June 28, 1865.

Total strength and casualties[]

The regiment suffered 12 enlisted men who were killed in action or who died of their wounds and 1 officer and 131 enlisted men who died of disease, for a total of 144 fatalities.[1]


  • Colonel Henry M. Day - Mustered out with the regiment.[2]

See also[]

  • List of Illinois Civil War Units
  • Illinois in the American Civil War


  1. The Civil War Archive website after Dyer, Frederick Henry. A Compendium of the War of the Rebellion. 3 vols. New York: Thomas Yoseloff, 1959.
  2. Illinois in the Civil War website after Illinois Adjutant General's muster rolls