The original field officers were Colonel Charles Edward Hovey of Bloomington, Lieutenant Colonel William R. Lockwood of Quincy, and Major Edward R. Roe of Bloomington. After Lockwood's resignation, Charles E. Lippincott of Chandlerville was promoted lieutenant colonel on 1 March 1862. After Hovey was promoted brigadier general on 5 September 1862, Lippincott was promoted colonel and Roe was promoted lieutenant colonel. Roe resigned on 29 May 1863 and was replaced as lieutenant colonel by Leander H. Potter of Bloomington. Potter resigned on 12 September 1864 and was replaced by Isaac H. Elliott of Princeton. Lippincott resigned on 10 September 1865 and Elliott briefly became colonel before the regiment was discharged. At discharge, Henry H. Pope of Taylorville was lieutenant colonel and Elijah H. Gray of Winchester was major.