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Top federal contractors in Illinois

2,927 SAM.gov-registered federal contractors based in Illinois. Ranked by lifetime federal award amount. Updated 2026-05-07.

Firms tracked
2,927
Top-50 lifetime $
$21.12B
Top NAICS
8

Top 50 federal contractors in Illinois

# Firm City NAICS Lifetime $ Contracts
1 ILLINOIS DEPARTMENT OF HUMAN SERVICE SPRINGFIELD 923120 $5.82B 0
2 ILLINOIS STATE BOARD OF EDUCATION SPRINGFIELD 541720 $2.63B 0
3 UCHICAGO ARGONNE, LLC CHICAGO — $1.38B 0
4 W S DARLEY & CO ITASCA — $1.27B 0
5 MEDLINE INDUSTRIES, LP NORTHFIELD 339112 $861.03M 0
6 FERMI FORWARD DISCOVERY GROUP, LLC CHICAGO 541715 $780.26M 0
7 SUPPLYCORE LLC ROCKFORD 493190 $645.53M 0
8 ILLINOIS ENVIRONMENTAL PROTECTION AGENCY SPRINGFIELD 924110 $616.53M 0
9 NORTHROP GRUMMAN SYSTEMS CORPORATION ROLLING MEADOWS 334511 $508.28M 0
10 NORTHWESTERN UNIVERSITY EVANSTON 541714 $463.65M 0
11 UNIVERSITY OF CHICAGO CHICAGO 518210 $396.49M 0
12 W.W. GRAINGER, INC. LAKE FOREST 444110 $361.64M 0
13 WALSH FEDERAL LLC CHICAGO 236220 $345.79M 0
14 UNIVERSITY OF ILLINOIS URBANA 541940 $327.97M 0
15 CARDINAL HEALTH 200, LLC WAUKEGAN 423450 $298.86M 0
16 CDW GOVERNMENT LLC VERNON HILLS 541512 $287.45M 0
17 UNIVERSITY OF ILLINOIS CHICAGO 541714 $277.32M 0
18 AAR GOVERNMENT SERVICES, INC. WOOD DALE 488190 $277.17M 0
19 DDB CHICAGO INC. CHICAGO 541810 $267.58M 0
20 NATIONAL OPINION RESEARCH CENTER CHICAGO 541990 $237.94M 0
21 SONOVA USA INC AURORA 811210 $232.96M 0
22 US FOODS INC ROSEMONT 311999 $224.86M 0
23 DMS PHARMACEUTICAL GROUP INC PARK RIDGE 325411 $222.32M 0
24 IMT DEFENSE CORP CHAMPAIGN 332993 $206.95M 0
25 DEPARTMENT OF PUBLIC HEALTH ILLINOIS SPRINGFIELD 923120 $181.11M 0
26 GENERAL DYNAMICS ORDNANCE & TACTICAL SYSTEMS, INC. MARION 332993 $178.73M 0
27 COVENANT AVIATION SECURITY, LLC NAPERVILLE 561612 $152.38M 0
28 AAR SUPPLY CHAIN, INC WOOD DALE 336413 $134.02M 0
29 BRIDGER RICHARD JV LLC CHICAGO 236220 $131.02M 0
30 ABBOTT LABORATORIES INC. ABBOTT PARK 334516 $120.16M 0
31 JONES LANG LASALLE AMERICAS, INC. CHICAGO 561210 $107.42M 0
32 KAY AND ASSOCIATES, INC. BUFFALO GROVE 336413 $102.93M 0
33 PARAGON MICRO INC BUFFALO GROVE 541519 $86.73M 0
34 ABBOTT LABORATORIES INC. NORTH CHICAGO 334516 $86.03M 0
35 WALSH-WESTERN WOOD JV CHICAGO 236220 $79.36M 0
36 ARCHER WESTERN FEDERAL JV CHICAGO 236220 $77.44M 0
37 CHERRY MEAT PACKERS, INC CHICAGO 311611 $71.51M 0
38 ARCHER-DANIELS-MIDLAND COMPANY CHICAGO 311211 $67.68M 0
39 SIEMENS INDUSTRY INC BUFFALO GROVE 561210 $58.95M 0
40 RUSH UNIVERSITY MEDICAL CENTER CHICAGO 622110 $58.04M 0
41 VETERAN TECHNOLOGY PARTNERS LLC DES PLAINES 541519 $56.50M 0
42 INSURANCE AUTO AUCTIONS, INC. WESTCHESTER 425120 $54.00M 0
43 WALSH GILBANE JV CHICAGO 236220 $51.50M 0
44 ANN & ROBERT H LURIE CHILDRENS HOSPITAL OF CHICAGO CHICAGO 541715 $48.42M 0
45 AEP ENERGY INC CHICAGO 221112 $47.81M 0
46 CHEMRING ENERGETIC DEVICES INC DOWNERS GROVE 541330 $46.95M 0
47 CHICAGO AMERICAN MANUFACTURING LLC CHICAGO 337122 $44.58M 0
48 ALLIED TUBE & CONDUIT CORPORATION HARVEY 331222 $44.34M 0
49 ILLINOIS DEPARTMENT OF VETERANS' AFFAIRS SPRINGFIELD 623110 $41.11M 0
50 ABBOTT LABORATORIES ABBOTT PARK 541714 $40.17M 0

Top NAICS in Illinois

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FAQ

How many federal contractors are based in Illinois?

BesaGov tracks 2,927 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.