This roster includes the known officers and enlisted men of the 21st Illinois Infantry, organized by Field & Staff and companies when available. Information is drawn from 19th-century state adjutant general reports, the Official Records, and verified regimental histories.
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For an overview of this regiment’s organization, service, engagements, and casualties, see the regiment summary page.
Research This Regiment
If you’re researching ancestors in the 21st Illinois Infantry, these resources may provide additional historical detail, including regimental histories and Civil War reference works.
Field & Staff
- Colonel: Ulysses S. Grant
- Colonel: John W. S. Alexander
- Lieutenant Colonel: John W. S. Alexander
- Lieutenant Colonel: George W. Peck
- Lieutenant Colonel: Warren E. McMakin
- Lieutenant Colonel: James E. Calloway
- Lieutenant Colonel: William H. Jamison
- Major: Warren E. McMakin
- Major: James E. Calloway
- Major: William H. Jamison
- Major: John L. Wilson
Company A (Macon County)
Some details are incomplete in surviving primary sources.
Company B (Cumberland County)
Some details are incomplete in surviving primary sources.
Company C (Piatt County)
Some details are incomplete in surviving primary sources.
Company D (Douglas County)
Some details are incomplete in surviving primary sources.
Company E (Moultrie County)
Some details are incomplete in surviving primary sources.
Company F (Edgar County)
Some details are incomplete in surviving primary sources.
Company G (Clay County)
Some details are incomplete in surviving primary sources.
Company H (Clark County)
Some details are incomplete in surviving primary sources.
Company I (Crawford County)
Some details are incomplete in surviving primary sources.
Company K (Jasper County)
Some details are incomplete in surviving primary sources.
Sources & Notes
- Official Records of the War of the Rebellion
- Illinois Adjutant General’s Report
- Dyer’s Compendium
- Contemporary regimental histories