BesaGov

Top federal contractors in Illinois

2,961 SAM.gov-registered federal contractors based in Illinois. Ranked by lifetime federal award amount. Updated 2026-08-08.

Firms tracked
2,961
Top-50 lifetime $
$21.13B
Top NAICS
8

Top 50 federal contractors in Illinois

# Firm City NAICS Lifetime $ Contracts
1 Illinois Department Of Human Service Springfield 923120 $5.82B 2
2 Illinois State Board Of Education Springfield 541720 $2.63B 4
3 Uchicago Argonne, Llc Chicago — $1.38B 2
4 W S Darley & Co Itasca 335999 $1.27B 5,262
5 Medline Industries, Lp Northfield 423450 $861.03M 21,636
6 Fermi Forward Discovery Group, Llc Chicago 541715 $780.26M 1
7 Supplycore Llc Rockford 493190 $645.53M 55,957
8 Illinois Environmental Protection Agency Springfield 924110 $616.53M 6
9 Northrop Grumman Systems Corporation Rolling Meadows 334511 $508.28M 674
10 Northwestern University Evanston 541940 $463.65M 128
11 University Of Chicago Chicago 541990 $396.49M 87
12 W.W. Grainger, Inc. Lake Forest 444110 $361.64M 289,130
13 Walsh Federal Llc Chicago 236220 $345.79M 50
14 University Of Illinois Urbana 541990 $327.97M 269
15 Cardinal Health 200, Llc Waukegan 325413 $298.86M 388,281
16 Cdw Government Llc Vernon Hills 334111 $287.45M 18,515
17 University Of Illinois Chicago 518210 $277.32M 217
18 Aar Government Services, Inc. Wood Dale 488190 $277.17M 228
19 Ddb Chicago Inc. Chicago 541810 $267.58M 43
20 National Opinion Research Center Chicago 541611 $237.94M 263
21 Sonova USA Inc Warrenville 334510 $232.96M 163
22 Us Foods Inc Rosemont 311999 $224.86M 1,477
23 Dms Pharmaceutical Group Inc Park Ridge 325411 $222.32M 42,563
24 Imt Defense Corp Champaign 332993 $206.95M 16
25 Department Of Public Health Illinois Springfield 518210 $181.11M 69
26 General Dynamics Ordnance & Tactical Systems, Inc. Marion 332993 $178.73M 68
27 Covenant Aviation Security, Llc Naperville 561612 $152.38M 6
28 Aar Supply Chain, Inc Wood Dale 336413 $134.02M 4,063
29 Bridger Richard Jv Llc Chicago 236220 $131.02M 6
30 Abbott Laboratories Inc. Abbott Park 325413 $120.16M 3,331
31 Jones Lang Lasalle Americas, Inc. Chicago 561210 $107.42M 638
32 Kay And Associates, Inc. Buffalo Grove 336413 $102.93M 78
33 Paragon Micro Inc Buffalo Grove 541519 $86.73M 590
34 Abbott Laboratories Inc. North Chicago 334516 $86.03M 5,341
35 Walsh-Western Wood Jv Chicago 236220 $79.36M 1
36 Archer Western Federal Jv Chicago 236220 $77.44M 14
37 Cherry Meat Packers, Inc Chicago 311611 $71.51M 178
38 Archer-Daniels-Midland Company Chicago 311211 $67.68M 317
39 Siemens Industry Inc Buffalo Grove 238220 $58.95M 1,910
40 Rush University Medical Center Chicago 622110 $58.04M 22
41 Veteran Technology Partners Llc Des Plaines 541519 $56.50M 158
42 Insurance Auto Auctions, Inc. Westchester 425120 $54.00M 66
43 Walsh Gilbane Jv Chicago 236220 $51.50M 1
44 Northern Illinois University Dekalb 611310 $48.49M 9
45 Ann & Robert H Lurie Childrens Hospital Of Chicago Chicago 541715 $48.42M 3
46 Aep Energy Inc Chicago 221112 $47.81M 7
47 Chemring Energetic Devices Inc Downers Grove 541330 $46.95M 357
48 Chicago American Manufacturing Llc Chicago 337122 $44.58M 85
49 Allied Tube & Conduit Corporation Harvey 334290 $44.34M 90
50 Illinois Department Of Veterans' Affairs Springfield 623110 $41.11M 1

Top NAICS in Illinois

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FAQ

How many federal contractors are based in Illinois?

BesaGov tracks 2,961 SAM.gov-registered firms whose physical state of business is Illinois. The list updates weekly as new entities register or update their SAM profile.

Who are the largest federal contractors in Illinois?

By lifetime federal award amount, the largest Illinois-based contractors include ILLINOIS DEPARTMENT OF HUMAN SERVICE, ILLINOIS STATE BOARD OF EDUCATION, UCHICAGO ARGONNE, LLC. See the full top-50 list above.

Can I get notified when a new firm registers in Illinois?

Yes. Sign up for the free weekly Illinois digest above. We'll email you new SAM.gov registrations and award activity for the state — no login required.

Is this data official?

Firm registrations come from SAM.gov entity public extracts. Lifetime award totals come from USAspending.gov. Both are official U.S. government data sources, refreshed weekly.