21st Regiment, Illinois Infantry

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United States   Gotoarrow.png   U.S. Military   Gotoarrow.png   Illinois   Gotoarrow.png   Illinois Military   Gotoarrow.png   Illinois in the Civil War   Gotoarrow.png   21st Regiment, Illinois Infantry

Brief History

The 21st Regiment, Illinois Infantry was organized at Mattoon, Illinois, and mustered in June 28, 1861. It mustered out at San Antonio, Texas, December 16, and discharged at Camp Butler, Illinois, January 18, 1866.[1].

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.

The following counties of origin are taken from the Adjutant General's Report, found on the Illinois Civil War Rosters web site. Roster pages are from the same report found on the Internet Archives web site. The rosters show the men who served in each regiment, their residences, dates of enlistment and mustering out, and other remarks.

Other Sources


  • 21st Illinois Infantry Regiment, (Seventh Congressional District Regiment), Three Year Service, May 15, 1861 - December 16, 1865, has histories and company rosters. (accessed 18 August 2011).
  • Illinois State Archives - Illinois Civil War Muster and Descriptive Rolls Database (accessed 14 June 2011). Search by residence, unit, regiment, company or soldier.



  1. National Park Service, The Civil War Soldiers and Sailors System (accessed 4 January 2011).