Illinois - Union
Cavalry
| 1st Regiment Cavalry | 2nd Regiment Cavalry | 3rd Regiment Cavalry |
| 4th Regiment Cavalry | 5th Regiment Cavalry | 6th Regiment Cavalry |
| 7th Regiment Cavalry | 8th Regiment Cavalry | 9th Regiment Cavalry |
| 10th Regiment Cavalry | 11th Regiment Cavalry | 12th Regiment Cavalry |
| 13th Regiment Cavalry | 14th Regiment Cavalry | 15th Regiment Cavalry |
| 16th Regiment Cavalry | 17th Regiment Cavalry | Stewart's Independent Cavalry Battalion |
| Thielman's Independent Cavalry Battalion | Barker's Dragoons | Carmichael's Independent Cavalry Company |
| Dollins' Independent Cavalry Company | Ford's Independent Cavalry Company | Gilbert's Independent Cavalry Company |
| Hutchin's Independent Cavalry Company | Jenk's Independent Cavalry Company | Dodson's Kane County Independent Cavalry Company |
| Marx's Independent Cavalry Company | McClellan's Dragoons | McClernand's Body Guard |
| Naughton's Irish Dragoons | O'Harnett's Independent Cavalry Company | Schambeck's Independent Cavalry Company |
| Sherer's Independent Cavalry Company | Smith's Independent Cavalry Company | Stewart's Independent Cavalry Company |
Artillery
| 1st Regiment Lt. Art., Battery "A" | 1st Regiment Lt. Art., Battery "B" | 1st Regiment Lt. Art., Battery "C" |
| 1st Regiment Lt. Art., Battery "D" | 1st Regiment Lt. Art., Battery E" | 1st Regiment Lt. Art., Battery "F" |
| 1st Regiment Lt. Art., Battery "G" | 1st Regiment Lt. Art., Battery "H" | 1st Regiment Lt. Art., Battery "I" |
| 1st Regiment Lt. Art., Battery "K" | 1st Regiment Lt. Art., Battery "K" (reorganized) | 1st Regiment Lt. Art., Battery "L" |
| 1st Regiment Lt. Art., Battery "M" | 2nd Regiment Lt. Art., Battery "A" | 2nd Regiment Lt. Art., Battery "B" |
| 2nd Regiment Lt. Art., Battery "C" | 2nd Regiment Lt. Art., Battery "D" | 2nd Regiment Lt. Art., Battery "E" |
| 2nd Regiment Lt. Art., Battery "F" | 2nd Regiment Lt. Art., Battery "G" | 2nd Regiment Lt. Art., Battery "H" |
| 2nd Regiment Lt. Art., Battery "I" | 2nd Regiment Lt. Art., Battery "K" | 2nd Regiment Lt. Art., Battery "L" |
| 2nd Regiment Lt. Art., Battery "M" | Bridges' Ind. Battery Lt. Art. | Busteed's Ind. Battery Lt. Art. |
| Chicago Board of Trade Ind. Battery Lt. Art. | Chapman's Peoria Ind. Battery Lt. Art. | Chicago Mercantile Ind. Battery Lt. Art. |
| Cogswell's Ind. Battery Lt. Art. | Colvin's Ind. Battery Lt. Art. | Cooley's Ind. Battery Lt. Art. |
| Renwick's Elgin Ind. Battery Lt. Art. | Henshaw's Ind. Battery Lt. Art. | Renwick's Ind. Battery Lt. Art. |
| Smith's Battery Chicago Lt. Art. | Springfield Ind. Battery Lt. Art. | Stokes' Ind. Battery Lt. Art. |
Infantry
| 7th Regiment Infantry (3 months) | 7th Regiment Infantry (3 years) | 8th Regiment Infantry (3 months) |
| 8th Regiment Infantry (3 years) | 9th Regiment Infantry (3 months) | 9th Regiment Infantry (3 years) |
| 10th Regiment Infantry (3 months) | 10th Regiment Infantry (3 years) | 11th Regiment Infantry (3 months) |
| 11th Regiment Infantry (3 years) | 12th Regiment Infantry (3 months) | 12th Regiment Infantry (3 years) |
| 13th Regiment Infantry | 14th Regiment Infantry | 15th Regiment Infantry |
| 16th Regiment Infantry | 17th Regiment Infantry | 18th Regiment Infantry |
| 19th Regiment Infantry | 20th Regiment Infantry | 21st Regiment Infantry |
| 22nd Regiment Infantry | 23rd Regiment Infantry | 24th Regiment Infantry |
| 25th Regiment Infantry | 26th Regiment Infantry | 27th Regiment Infantry |
| 28th Regiment Infantry | 29th Regiment Infantry | 30th Regiment Infantry |
| 31st Regiment Infantry | 32nd Regiment Infantry | 33rd Regiment Infantry |
| 34th Regiment Infantry | 35th Regiment Infantry | 36th Regiment Infantry |
| 37th Regiment Infantry | 38th Regiment Infantry | 39th Regiment Infantry |
| 40th Regiment Infantry | 41st Regiment Infantry | 42nd Regiment Infantry |
| 43rd Regiment Infantry | 44th Regiment Infantry | 45th Regiment Infantry |
| 46th Regiment Infantry | 47th Regiment Infantry | 48th Regiment Infantry |
| 49th Regiment Infantry | 50th Regiment Infantry | 51st Regiment Infantry |
| 52nd Regiment Infantry | 53rd Regiment Infantry | 54th Regiment Infantry |
| 55th Regiment Infantry | 56th Regiment Infantry | 57th Regiment Infantry |
| 58th Regiment Infantry | 59th Regiment Infantry | 60th Regiment Infantry |
| 61st Regiment Infantry | 62nd Regiment Infantry | 63rd Regiment Infantry |
| 64th Regiment Infantry | 65th Regiment Infantry | 66th Regiment Infantry |
| 67th Regiment Infantry | 68th Regiment Infantry | 69th Regiment Infantry |
| 70th Regiment Infantry | 71st Regiment Infantry | 72nd Regiment Infantry |
| 73rd Regiment Infantry | 74th Regiment Infantry | 75th Regiment Infantry |
| 76th Regiment Infantry | 77th Regiment Infantry | 78th Regiment Infantry |
| 79th Regiment Infantry | 80th Regiment Infantry | 81st Regiment Infantry |
| 82nd Regiment Infantry | 83rd Regiment Infantry | 84th Regiment Infantry |
| 85th Regiment Infantry | 86th Regiment Infantry | 87th Regiment Infantry |
| 88th Regiment Infantry | 89th Regiment Infantry | 91st Regiment Infantry |
| 92nd Regiment Infantry | 93rd Regiment Infantry | 94th Regiment Infantry |
| 95th Regiment Infantry | 96th Regiment Infantry | 97th Regiment Infantry |
| 98th Regiment Infantry | 99th Regiment Infantry | 100th Regiment Infantry |
| 101st Regiment Infantry | 102nd Regiment Infantry | 103rd Regiment Infantry |
| 104th Regiment Infantry | 105th Regiment Infantry | 106th Regiment Infantry |
| 107th Regiment Infantry | 108th Regiment Infantry | 109th Regiment Infantry |
| 110th Regiment Infantry | 111th Regiment Infantry | 112th Regiment Infantry |
| 113th Regiment Infantry | 114th Regiment Infantry | 115th Regiment Infantry |
| 116th Regiment Infantry | 117th Regiment Infantry | 118th Regiment Infantry |
| 119th Regiment Infantry | 120th Regiment Infantry | 121st Regiment Infantry |
| 122nd Regiment Infantry | 123rd Regiment Infantry | 124th Regiment Infantry |
| 125th Regiment Infantry | 126th Regiment Infantry | 127th Regiment Infantry |
| 128th Regiment Infantry | 129th Regiment Infantry | 130th Regiment Infantry |
| 131st Regiment Infantry | 132nd Regiment Infantry | 133rd Regiment Infantry |
| 134th Regiment Infantry | 135th Regiment Infantry | 136th Regiment Infantry |
| 137th Regiment Infantry | 138th Regiment Infantry | 139th Regiment Infantry |
| 140th Regiment Infantry | 141st Regiment Infantry | 142nd Regiment Infantry |
| 143rd Regiment Infantry | 144th Regiment Infantry | 145th Regiment Infantry |
| 146th Regiment Infantry | 147th Regiment Infantry | 148th Regiment Infantry |
| 149th Regiment Infantry | 150th Regiment Infantry | 151st Regiment Infantry |
| 152nd Regiment Infantry | 153rd Regiment Infantry | 154th Regiment Infantry |
| 155th Regiment Infantry | 156th Regiment Infantry | Sturgis Riflese |