Civil War common practice was utilized for Regiments with unknown nicknames, and the Colonel's name was plugged in temporarily. IE: 63 Mord's (Francis) Regiment.

The sources for the following Illinois data is as follows:
A.- Illinois Military Units in the Civil War as published by the Civil War Centennial Commission of Illinois, November 1962 and provided  by Frank Crawford 

B- Google
    1.- Illinois Adjutant General's Office
    2.- Dyers Compendium

  1-6 Regiments not assigned  
    7- Fremont's Rifles 
Mounted infantry(temporary)
------
   8- Oglesgy's (R.J.) Regt.  
   9-
      Mounted infantry(temporary)
------
  10- The Twins (campaigned with 14th [or 16th] reg)or Morgan's (J.D.) Regt.
      F. Houghtaling's (Chas) Battery (3 mos)
      F. Ottowa Battery (3 mos)
      I. Hopkin's (Caleb) Light Artillery Battery (3 mos)
      I. Springfield Artillery (3 mos)
      K. McAllister's (Edward ) Battery (3 mos)
      K. Plainfield Artillery ( 3 mos)
------
  11-
      G. McArthur's Escort Cavalry
------
  12- 1st Scotch Regiment
  13- Fremont's Greyhounds/ Wyman's (John B.) Reg
------
  14- The Twins (campaigned with 10th reg)/ Palmer's Reg.
      L. Chapman's (Fletcher H) Battery, 1st
------
  15-
  16- The Twins (campaigned with 10th/ Palmer's Reg.)
------
  17-
      A. Pope's Bodyguard
------
  18-
      K. Ram Monarch Marine Detachment(old)
------
  19- Turchin's (John B.) Reg.
      A. Chicago Zouaves
      B. Elmira Guards
      C. Chicago Zouaves
      D. Chicago Light Infantry
      E. Highlands Guards
      F. Cass County Guards
      H. Moline Rifles
      I. Anti- Beauregards
------
  20-
  21- Seventh Congressional District Reg
  22-
------
  23- 1st Chicago Irish Regt.
      A. Detroit (Mich) Jackson Guards
      B. Montgomery Guards
      C. Mahoney Guards / Jackson Guards
      D. Earlville Guards or Earl Rifles
      E. Ottowa Guards
      F. LaSalle Guards
      H. Ottowa Guards
      I. Shields Guards
      K. Shields Guards
   ? Oconto (Wisconsin) Irish Guards (Artillery)
------
  24- 1st Hecker Reg/ Hecker Jager/? Lincoln Rifles/? Mihalotzy Rifles
------
  25- McClelland's (J.S.) Reg
  26-
------
  27-
      E. Hutchen's (William A.) Cavalry Co
  28-
------
  29-
      B. Carmichael's (Eagleton) Cavalry
------
  30-
      D. O'Hartnette's (M.J.) Cavalry Company
------  
  31- Dirty- First/ Shawnee Classics/ Logan's (J.A.) Reg
      A. Dresser's (Jasper M.) Battery
      C. Dollin's (James J.) Cavalry Company
------
  32-
      A. Gilmore's (Ephraim M.) Cavalry Company
------
  33- Brains/ Normal/ Teacher's Regiment
      K. Bateman Rifles
------
  34- Rock River/ Red River Rifle Regiment
  35- Smith's (Gustavus A.) Independent Regiment
------
  36- Fox River / Sheridan's Pets/ Greusal's (Nicholas) Regiment
      A. Hamilton's Escort (Cav.)
      A. Jenk's (Albert) Cav. or dragoons
      A. Rosecran's Escort
      A. Willis's (George A.) Cav. Co.
      B. Davis' Escort
      B. Sherer's (Samual B.) Cav. Co.
      B. Smith's (Henry B.) Cav. Co.
------
  37- Freemont Rifles/ Illinois Greyhounds
  38-
  39- Yates Phalanx
  40-
------
  41-
      A. Decatur grays
      H. Shelby Tigers
------
  42- 1st Douglas Brigade
  43- Koerner Regiment
------
  44-
      ? Northwestern Rifles
------
  45- Washburn Lead Mine Regiment
     E. Goodwin Rifles  
------
  46- Davis's (John A.) Regiment
  47-
  48-
  49- Morrison's (William R.) Regiment
  50- Blind Half Hundred Regiment
      Mounted infantry (Temporary)
------
 51- Chicago Legion
      ?. Ryan Life Guard
------
  52- Sweeney's (T.W.) Regiment
     A. Gilbert's (F.T.) Cav. Co.
------
  53-
      A. Cogwell's Battery
      A. Ford's (William) Independent Cav. Co.
------
  54- Mitchell's (G.M.) Regiment
------
  55- Canton Rifles/ 2nd Douglas Brigade
      F. Bushnell Light Guards
------
  56-
      A. Wisconsin Mechanics & Fusilleers
      B. Ohio Mechanics & Fusilleers
      C. Indiana Mechanics and Fusilleers
      H. Ohio Mechanics & Fusilleers
------
  57- National Guards
------
  58-
       ? Lyon Color Guard
       ? McClelland Brigade
------
  59- Formerly 9th Missouri Zouave Regiment
      K. Chicago Sappers and Miners
      ? Switzerland Ram Marine Detachment (part)
  60-
  61-

  62- True's (James M. ) Regiment
------
  63- Moro's (Francis) Regiment
      ?. Switzerland Ram Marine Detachment (Part)
------
  64- Yates Sharpshooter Regiment
      A-F Yates Sharpshooters
------
  65- 2nd Scotch Regiment/Cameron's (Daniel) Highlanders
------
  66- Western Sharpshooters /Birges Regiment (formerly 14 Mo.)
       D. Michigan Company Sharpshooters, John Piper
      G. Ohio Sharpshooters
      H. Ohio Sharpshooters
      K. Ohio Sharpshooters
------
  67-
  70- (3 mos)
  71- (3 mos)
------
  72- 1st Chicago Board of Trade Regiment
     ?. Hancock Guards
------
  73- Persimmon/ Preacher Regiment
  74- Marsh's (Jason) Regiment
  75-
  76- Mack's (A.W.) Regiment
  77-
  78-
  79- Guinnip's (Lyman) Regiment
------
  80- Allen's (T.C.) Regiment
     ?. Mounted infantry (temporary)
------
  82- 2nd Hecker Regiment
     C. Concordia Guards
     D. Scandivaneans
------
  83-
  84-
  85-
  86- Iron's (David C.) Regiment
  87-
     ?. Mounted Infantry(Temporary)
------
  88- 2nd Chicago Board of Trade Regiment
  89- Railroad regiment
  90- Irish Legion/ O'Meara's (Timothy) Regiment
  91- Day's (Henry M.) Regiment
-----
  92- Atkin's Regiment
     ?. Mounted infantry (temporary)
------
  93-
  94- McLean County Regiment
  95-
  96-
  97-
------
  98- Funkhouser's (John J.) Regiment
      ?. Mounted infantry (Temporary)
------
  99- Bailey's (George W) Regiment
 100- Bartleson's (Fred A.) Regiment
------
 101- Fox's (Charles H.) Regiment
      ?. Switzerland Ram marine detachment (part)
------
 102-
 103-
 104-
 105-
 106-
------
 107-
      ?. Boyle's Battery
      ?. Colvins Battery
------
 108-
 109-
 110- Casey's (Thomas R.) Regiment
 111-
------
 112-
      ?. Mounted infantry (temporary)
------
 113- 3rd Chicago Board of Trade Regiment
 114- Judy's Regiment
 115- 2nd Preachers Regiment
 116- Tupper's (Nathan W.) Regiment
 117- Moore's (Risdon M.) Regiment
 118- Fonda's (John E.) Regiment
 119- Kinney's (Thomas J.) Regiment
 120-
 121-
 122-
------
 123-
        ?. Mounted infantry (Temporary)
------
 124- Excelsior Regiment  aka the Hundred and Two Dozen
 125-
 126- Richmond's (Jonathan) Regiment
 127-
 128-
 129- Smith's (George P.) Regiment
 130-
 131-
 132-
 133-
 134-
 135-
 136-
 137-
 138-
 139-
 140-
 141-
 142- Ankney's (Roland V.) Regiment
 143- Smith's (Dudley C.) Regiment (100 days)
------
 144-
      A. Stookey's (Simon J.) Independent Co (100 days)
      B. Curtis' (John) Independent Co (100 days)
------
 145-
 146-
 147-
 148-
 149- Kueffer's (William C.) Regiment
 150-
 151- Woodall's (French B.) Regiment
 152- Stephenson's (Ferdinand D.) Regiment
 153-
 154-
 155- Smith's (Gustave H.) Regiment
 156-
------
Independent Infantry Units
Alton Battalion infantry (100 days)
Steele's (James) Independent Co Infantry- Steele's Rifles
Kowald's (Gustav) Co infantry- Turner Union Cadets
Walker's (Joseph D.) Independent Co Infantry (3 mos)

   2-
      A. Logan's Escort
      A. Ord's Escort
      A. Stevenson's Escort
      B. Quimby's Escort
      C. Adams County Cav (later L)
      L. Adams County Cav (prev. C)
      M. McKean's Escort

   3- Carr's (Eugene A.) Regiment
      A. Morgan's (George W.) Escort
      D. Steele's Escort
      E. Morgan's (George W.) Escort- later 4 &5 Mo
      L. McClernand's Escort

   4- 
      A. Grant's Escort
      B. Carmichael's (Eagleton) Cav. Co. #2
      C. Dollins' (James J.) Cav. Co.
      D. Quinby's Escort

   5- Wilson's (Hall) Regiment
      ?. Franklins (Angereau) Horse Artillery

   6-
   7- Kellog's Regiment
      B. Rosecran's Escort
      B. Smith's (William S.) Escort
      C. Morgan's (James D.) Escort
      C. Palmer's (John M.) Escort
------  
   8-
   9- Brackett's (Albert G.) Cav. Reg.
  10- 
------
  11-
      G. Blair's Escort
      G. Crocker's Escort
      G. McArthur's Escort
------
  12-
      A. Gilmore's (Ephraim M.) Cav. Co- later Co F
      F. per above
      H. Barker's (Charles W.) Dragoons- Co A
      H. Gilbert's (Franklin T.) Cav. Co.- later transferred to 15th Reg.
      H. McClellan Dragoons, Co A
      I. Barker's (Charles W.) Dragoons- Co B
      I. McClellan Dragoons, Co B
------
  13- German Guide
Hartmann's (Theobald) Dragoons- 1 Battalion
------
  14-
      A-F Stewart's (Warren) Independent Cav Cos
      B. Carmichael's (Eagleton) Cav. Co.
      D. O'Harnett's (M.J.) Cav. Co.
      H. Wilder's Cav. Co.
      H. Steele's Escort
      I. Willis' (George A.) Cav. Co.
      K. William's Escort
      K. Smith's (Henry A.) Cav. Co.
      K. Slocum's Escort
      K. Sherer's (Samual B.) Cav. Co.
------
  15-
      C. Dollin's (James J.) Cav. co.
      D. Clinton County Cav.
      E. Hutchen's (William D.) Cav. Co.
      G. Gilbert's (Franklin T.) Cav. Co.
      H. Kane County Cav.
      I. Hamilton's Escort
      I. Jenk's (Albert) Cav. co.
      I. Rosecrans Escort
      K. Davis's Escort- prev. 3 Ky., Co G
      K. Hooker's Escort
------
  16-
      A. Chicago Cavalry
      A. Thielmann's (Christian)-
Co. A
      B. Chicago Cavalry
      B. Thielmann's (Christian) co. B
      C. Chicago Dragoons or Rifles
      C. Hoffman Dragoons- co B
      C. Schumbeck's (Frederick ) Cav. co.
      C. Washington Light Cav.
      I. McClernand Guard Battalion or bodyguard
      L. Same
      K. same 
------
  17-
  18-
------
Independent Cavalry Units
Charles W. Barker's Independent Co. Chicago Dragoons (2 mos)- Barker's 
Dragoons
Bowen's Independent Battalion- later 9th and 10th Missouri
Warren Steward's Independent Battalion Cav Cos.
Oscar H. Huntley's Independent Cavalry- Co A
Robert H. Graham's Cav Co L

 1st 
      A. Bridges Battery
      A. Chicago Light Artillery, co A
      A. Morgan's (Francis) Battery
      A. Smith's (James) Battery 
      A. Wilcox's (Edward P.) Battery
      A. Willard's (Charles M.) Battery
      A. Wood's (Peter P.) Battery
      B. Barrett's (Samuel E.) Battery
      B. Chicago Light Artillery, co B
      B. Ramsey's (Israel P.) Battery
      B.Taylor's (Ezra) Battery
      B. White's (Lyman A.) Battery
      C. Channel's (John R.) Battery
      C. Houghtaling's (Charles) Battery
      C. Ottowa Artillery, co A
      C. Prescott's (Mark K.) Battery
      D. Cooper's (Edgar H.) Battery
      D. McAllister's (Edward) Battery
      D. Plainfield Artillery
      D. Rodger's (Henry A.) Battery
      E. Cram's (Orrin W.) Battery
      E. Fitch's (John A.) Battery
      E. Waterhouse's (Allen C.) Battery
      F. Burton's (Josiah H.) Battery
      F. Chaney's (John T.) Battery
      G. Chicago Light Artillery, co G
      G. O'Leary's Battery
      G. Rombauer's (Raphael G.) Battery
      G. O'Leary's Siege Artillery
      H. Degress' (Francis) Battery
      H. Hart's (Levi W.) Battery
      H. Silversparrel's (Axel) Battery
      I. Bouton's (Edward) Battery
      I. Cudney's (Albert) Battery
      I. Neely's (John C.) Battery
      K. Colvin's Battery
      K. Franklin's (Angereau) Battery
      K. Smith's (Jason B.) Battery
      L. Mulligan's Battery
      L. Ocanto (Wisconsin) Irish Guards
      L. Rouark's (John) 11th Wisconsin Independent Battery
      M. Cogwell's Battery
      M. Spencer's (George W.) Battery

  2nd 
      A. Davidson's Battery
      A. Peoria Light Artillery
      B. Chapman's (Fletcher H.) Battery- 1st
      B. Madison's (Reilly) Battery
      C. Flood's (James P.) Battery
      C. Springfield Artillery
      D. Campbell's (Charles C.) Battery
      D. Chapman's (Fletcher H.) Battery- 2nd
      D. Cooper's (Charles S.) Battery
      D. Dresser's (Jasper M.) Battery
      D. Timoney's (James P.) Battery
      E. Gumbart's (George C.) Battery
      E. Schwartz's Missouri Battery
      E. Nispel's (George L.) Battery
      F. Richardson's (George R.) Battery
      G. Lowel's (John W.) Battery
      G. Sparrestrom's (Frederick) Battery A
      G. Stolbrand's (Charles G.) Battery
      H. Stenbeck's (Andrew) Battery
      H. Whittemoe's (Henry C.) Battery
      I. Barnett's (Charles M.) Battery
      I. Keith's (Charles W.) Battery
      I. Rich's (Judson) Battery
      K. Barber's (Thomas C.) Battery
      K. Rodger's (Benjamin F.) Battery (prev. D)
      L. Bolton's (William H.) Battery
      L. Hulaniski's (Thaddeus C.) Battery
      L. Nichol's (Erastus A.) Battery
      M. Phillip's (John C.) Battery

  3rd 
      C. Hopkin's (Caleb) Battery

  Independent Units
   Ist Ind Battery- Cogswell's (William) Battery
  2nd Ind Battery- Stoke's (James H.) Battery
  3rd Ind Battery- Vaughn's (Thomas F.) Battery
  4th Ind Battery- Cooley's (Charles C.) Battery
  5th Ind Battery- Renwick's (Charles W.) Battery
  6th Ind Battery- Henshaw's (Edward C.) Battery
  7th Ind Battery- Colvin's (John H.) Battery