| Name | Rank | Residence | Date of Rank or Enlistment | Date of Muster | Remarks |
| BABCOCK, Andrew J. | Colonel | Springfield | 21 Mar. 1862 | ------ | Resigned 28 Feb 1863 |
| BABCOCK, Andrew J. | Lt.Colonel | Springfield | 25 July 1861 | 25 Jul 1861 | Promoted |
| BROWN, William Jr. | Quartermaster | Aurora | 25 July 1861 | 25 Jul 1861 | Died 09 Oct 1863: wounds |
| BURTON, Elijah P. | 1st Ass't Surgeon | Springfield | 23 Jan. 1864 | 29 Feb 1864 | Prom. Surgeon 12th Inf. |
| COOK, John | Colonel | Springfield | 25 Apr. 1861 | 25 Jul 1861 | Pro.Brig.Gen.21Mar.'63 |
| DAVIS, Jesse P. | Chaplain | Alton | 25 July 1861 | 25 Jul 1861 | Resigned 25 Sept 1862 |
| ESTABROOK, George H. | Major | Atlanta | 12 Nov. 1862 | 25 Jan 1863 | Discharged 24 Apr 1864 |
| FRANCIS, Thomas N. | Adjutant | Springfield | 21 Mar. 1862 | ------ | Resigned 14 Nov. 1862 |
| GREUSEL, Nicholas | Lt.Colonel | Aurora | 24 July 1861 | ------ | Promoted Colonel 36th Inf. |
| GREUSEL, Nicholas | Major | Aurora | 25 Apr. 1861 | ------ | Promoted |
| HAMILTON, James | 1st Ass't Surgeon | Springfield | 19 July 1861 | 25 Jul 1861 | Prom. Surgeon 120th Inf. |
| HARRISON, George M. | Quartermaster | TerreHauteIN | 9 Oct. 1862 | 02 Nov 1862 | Mustered out 09 Jul 1865 |
| JOHNSON, Edward S. | Major | Springfield | 22 Apr. 1864 | 29 Jul 1864 | Mustered out 09 Jul 1865 |
| LEONARD, William | Surgeon | ------ | 3 Nov. 1863 | 24 Dec 1864 | Mustered out 09 Jul 1865 |
| McFARLAND, George C. | 2nd Ass't Surgeon | ------ | 23 Jan. 1863 | 29 Jan 1863 | Dismissed 27 Oct 1863 |
| METCALF, Richard L. | Surgeon | Springfield | 16 July 1861 | 25 Jul 1861 | Resigned 13 Sep 1863 |
| MONROE, James | Major | Mattoon | 21 Mar. 1862 | ------ | Resigned 03 Sep 1862 |
| MORSE, Eugene F. | Adjutant | ------ | 5 Oct. 1864 | 01 Feb 1865 | Mustered out 09 Jul 1865 |
| PERKINS, William | Chaplain | ------ | 5 Dec. 1862 | ------ | Resigned 20 Apr 1864 |
| PERRIN, Hector | Lt.Colonel | Mattoon | 19 Apr. 1864 | 01 Jul 1864 | Mustered out 09 Jul 1865 |
| ROBINSON, John S. | Adjutant | Alton | 14 Nov. 1862 | 10 Jan 1863 | Died 04 Jan 1865: wounds |
| ROWETT, Richard | Colonel | Carlinville | 28 Feb. 1863 | 02 Jul 1863 | Prom. Brev. Brig. Gen. 24 May 1865 |
| ROWETT, Richard | Lt.Colonel | Carlinville | 21 Mar. 1862 | 28 Apr 1862 | Promoted |
| ROWETT, Richard | Major | Carlinville | 25 July, 1861 | 22 Jul 1861 | Promoted |
| SMITH, Benjamin F. | Adjutant | Springfield | 1 Feb. 1862 | ------ | Prom. Gen. Cook's Staff |
| WALLER, Leroy R. | Adjutant | GreenwichN.Y. | 25 July, 1861 | 25 Jul 1861 | Resigned 30 Jun 1862 |
Transcribed by Christine Ross
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