The 100 Largest Companies In Illinois For 2021

By Chris Kolmar - Jun. 7, 2021

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If you live in Illinois and you’re looking for a job, you have come to the right place.

Because, sure, you can google things like ‘biggest companies in Illinois’ and get a fairly long list of companies with a lot of employees, or perhaps that have the biggest names — but here, we bring you the companies with the most current employees that are actually headquartered in Illinois.

Below, we’ll give you a complete list of Illinois’s 100 largest companies, but first, here’s a look at the top 10:

  1. Walgreens
  2. McDonald’s
  3. Boeing
  4. Caterpillar
  5. Abbott Laboratories
  6. United Airlines
  7. Sears Holdings
  8. Harrisburg Medical Center
  9. Mondelez International
  10. Veolia Environmental Services North America

Walgreens comes in at the top, with more current employees than any other company in the state. We’ll get to specifics in a moment; first, here’s a look at our methodology.

How we identified the biggest companies in Illinois

Here at Zippia we have developed a database of over 250,000 companies that spans the entire country.

For this report, we looked at the companies headquartered in Illinois with at least 100 employees. That left us with 1,602 companies.

We then ranked each company from most to least current employees to determine the biggest companies in Illinois.

As it turns out, Walgreens looks to the be the biggest company in Illinois clocking in with 253,400 employees.

Now, check out how the 100 biggest companies in Illinois ranked.

If you’re interested, you can read more about the Illinois job scene here:

Detailed List Of The 100 Biggest Companies In Illinois

Rank Company City Employees
1 Walgreens Deerfield 253,400
2 McDonald’s Oak Brook 210,000
3 Boeing Chicago 153,027
4 Caterpillar Peoria 101,500
5 Abbott Laboratories North Chicago 99,000
6 United Airlines Chicago 93,000
7 Sears Holdings Hoffman Estates 89,000
8 Harrisburg Medical Center Harrisburg 85,000
9 Mondelez International Deerfield 83,000
10 Veolia Environmental Services North America Chicago 77,864
11 JLL Chicago 77,300
12 State Farm Bloomington 65,664
13 John Deere Moline 60,476
14 Grant Thornton Chicago 53,000
15 Upp Technology Hinsdale 50,000
16 Illinois Tool Works Glenview 50,000
17 Aon Chicago 50,000
18 Landis Plastics Alsip 48,000
19 Baxter International Deerfield 48,000
20 LKQ Chicago 45,500
21 Hyatt Hotels Chicago 45,000
22 Kmart Hoffman Estates 45,000
23 Allstate Northfield 42,900
24 RR Donnelley Chicago 42,700
25 H Group Holding Chicago 42,000
26 Carver Military Academy Chicago 37,322
27 Molex Lisle 36,000
28 Exelon Chicago 33,400
29 Archer Daniels Midland Chicago 32,300
30 Tenneco Lake Forest 32,000
31 Elite Staffing Chicago 32,000
32 Jewel-Osco Itasca 30,000
33 Dover Downers Grove 29,000
34 AbbVie North Chicago 29,000
35 McKinsey Company Chicago 27,000
36 Arthur J. Gallagher Co. Rolling Meadows 26,783
37 Durham School Services Lisle 26,151
38 SP Plus Chicago 26,000
39 WW Grainger Lake Forest 25,700
40 HSBC North America Holdings Lake Forest 25,151
41 US Foods Rosemont 25,000
42 McDermott Will Emery Chicago 25,000
43 Northwestern Medicine Chicago 24,507
44 Ulta Beauty Bolingbrook 24,200
45 ULTRA Diamonds Chicago 24,200
46 LSC Communications Chicago 24,000
47 Fortune Brands Home Security Deerfield 23,870
48 Stericycle Lake Forest 23,200
49 Medline Industries Northfield 23,000
50 Lsis Usa Vernon Hills 23,000
51 The Owens Group Chicago 22,500
52 BP America Warrenville 22,100
53 Health Care Service Chicago 22,000
54 OSF HealthCare Peoria 20,912
55 Aldi Batavia 20,335
56 OSI Group Aurora 20,000
57 Hospira Lake Forest 19,000
58 Northern Trust Chicago 18,800
59 ABN AMRO Chicago 18,720
60 Follett Westchester 18,542
61 Claire’s Hoffman Estates 18,100
62 Dominick’s Finer Foods Oak Brook 18,000
63 Reyes Holdings Rosemont 17,792
64 Motorola Solutions Chicago 17,000
65 Stock Yards Packing Rosemont 16,960
66 Swift Processed Meats Co Chicago 16,500
67 Lafarge North America Chicago 16,400
68 Dominion Energy Chicago 16,200
69 Wm Wrigley Jr Company Chicago 16,000
70 Discover Financial Services Riverwoods 15,549
71 Yaskawa America Waukegan 15,287
72 Brunswick Lake Forest 15,116
73 Illinois Bell TelephoneCompany Chicago 14,929
74 Hospital Sisters Health System Springfield 14,626
75 Packaging Corporation of America Lake Forest 14,600
76 BMO Harris Bank Chicago 14,200
77 Komatsu America Rolling Meadows 14,000
78 TreeHouse Foods Oak Brook 13,489
79 Addus HomeCare Downers Grove 12,760
80 AptarGroup Crystal Lake 12,700
81 Conagra Brands Chicago 12,600
82 Bally Total Fitness Chicago 12,340
83 Flex-N-Gate Urbana 12,150
84 UL Northbrook 12,000
85 Dyson Chicago 12,000
86 Littelfuse Chicago 12,000
87 Navistar Lisle 11,926
88 Quaker Oats Company Chicago 11,858
89 ClearStaff Aurora 11,500
90 University of Illinois at Chicago Chicago 11,399
91 Ingredion Westchester 11,000
92 Amsted Industries Chicago 11,000
93 Pactiv Lake Forest 11,000
94 MAT Holdings Long Grove 11,000
95 NorthShore University HealthSystem Evanston 10,596
96 Camping World Lincolnshire 10,227
97 Advocate Health Care Downers Grove 9,931
98 Telephone and Data Systems Chicago 9,900
99 RSM US Chicago 9,670
100 Staff Management Chicago 9,150

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Chris Kolmar

Author

Chris Kolmar

Chris Kolmar is a co-founder of Zippia and the editor-in-chief of the Zippia career advice blog. He has hired over 50 people in his career, been hired five times, and wants to help you land your next job. His research has been featured on the New York Times, Thrillist, VOX, The Atlantic, and a host of local news. More recently, he's been quoted on USA Today, BusinessInsider, and CNBC.

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