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IT & computer services in Illinois

3,321 it & computer services listed across 369 cities in Illinois.

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USA Business Search lists 3,321 it & computer services in Illinois. The most are in Chicago (1,015), Schaumburg (137), Naperville (123).

Updated October 2026

IT & computer services by city

Chicago (1,015)Schaumburg (137)Naperville (123)Aurora (54)Oak Brook (49)Northbrook (47)Rolling Meadows (39)Arlington Heights (38)Downers Grove (38)Elgin (37)Bloomington (37)Springfield (36)Lombard (36)Lisle (36)Champaign (34)Peoria (33)Rockford (29)Evanston (29)Skokie (29)Crystal Lake (24)Palatine (23)Wheaton (23)Bolingbrook (23)Orland Park (20)Buffalo Grove (20)Oakbrook Terrace (20)Itasca (20)Joliet (19)Bloomingdale (19)Deerfield (18)Des Plaines (17)Park Ridge (17)Warrenville (17)Libertyville (16)Plainfield (16)Mount Prospect (16)Hoffman Estates (16)Rosemont (16)St. Charles (15)Oak Park (15)Glenview (14)Elk Grove Village (13)Elmhurst (13)Vernon Hills (13)Moline (12)Addison (12)Tinley Park (12)Edwardsville (12)Mundelein (12)Lake Forest (12)Geneva (11)Mokena (11)Westmont (11)Villa Park (11)Lincolnwood (11)Burr Ridge (11)Gurnee (10)Barrington (10)Algonquin (10)Effingham (10)Carol Stream (10)Lake Zurich (10)Romeoville (10)Frankfort (9)Glen Ellyn (9)Wheeling (9)Carbondale (9)Normal (9)Batavia (9)East Peoria (9)Urbana (8)Danville (8)Woodstock (8)Homewood (8)Westchester (8)Lake Bluff (8)Belleville (7)Highland Park (7)Niles (7)Marion (7)Dekalb (7)West Chicago (7)Bensenville (7)Bourbonnais (7)Woodridge (7)Morton (7)Wood Dale (7)Lincolnshire (7)O Fallon (7)Decatur (6)Waukegan (6)Oswego (6)Alton (6)Loves Park (6)Freeport (6)Fairview Heights (6)Roselle (6)Lemont (6)Morton Grove (6)Darien (6)Quincy (5)New Lenox (5)Melrose Park (5)Mount Vernon (5)Granite City (5)Collinsville (5)Wilmette (5)Lansing (5)Machesney Park (5)Northfield (5)Galena (5)Carpentersville (5)Shelbyville (5)McHenry (4)Galesburg (4)Pekin (4)Ottawa (4)Sycamore (4)Morris (4)Mattoon (4)

Well-documented it & computer services in Illinois

A sample of listings with a street address, phone number and website, one per city.

How to choose an IT company in Illinois

  • Ask who will actually do the work and how often you'll hear from them.
  • Get the scope, price and timeline in writing.
  • Ask for two references from clients like you.

Common questions

How many it & computer services are listed in Illinois?

USA Business Search lists 3,321 it & computer services in Illinois, in 369 cities and towns.

Which Illinois cities have the most it & computer services?

Chicago (1,015), Schaumburg (137), Naperville (123), Aurora (54), Oak Brook (49).

How do I verify a Illinois business?

Use the state's official business search and licensing boards, linked in our Illinois business lookup guide.

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