317-622-8970Search all companies →Healthcare & Life Science Companies in Illinois
175,537 companies in Healthcare & Life Science in Illinois.
Explore 175,537 Healthcare & Life Science in Illinois listed with contact details, employee size, revenue, and NAICS/SIC codes. Compare suppliers and service providers side by side and reach the right companies directly, or view the same industry in Healthcare & Life Science in California, Healthcare & Life Science in Florida, Healthcare & Life Science in Texas.
Largest Healthcare & Life Science in Illinois companies by revenue
The highest-revenue companies in this directory. Open any profile for its full firmographics.
| # | Company | Location | Employees | Revenue |
|---|---|---|---|---|
| 1 | CommonSpirit Health | Chicago | 160,000 | $39.1B |
| 2 | McDonald's Corp | Chicago | 150,000 | $26.9B |
| 3 | Advocate Aurora Health | Downers Grove | 150,000 | $14B |
| 4 | Northwestern Medicine | Chicago | 38,000 | $9.6B |
| 5 | Hyatt Hotels Corp | Chicago | 242,000 | $7.1B |
| 6 | Option Care Health Inc | Bannockburn | 8,000 | $5.6B |
| 7 | Advocate Health Care | Downers Grove | 35,816 | $5.3B |
| 8 | OSF Healthcare System | Peoria | 23,792 | $4.1B |
| 9 | Select Rehabilitation LLC | Glenview | 21,000 | $3.1B |
| 10 | TAG - The Aspen Group | Chicago | 20,000 | $2.9B |
Healthcare & Life Science in Illinois companies by size and revenue
| Employees | Companies | Share |
|---|---|---|
| 1-50 | 173,385 | 98.8% |
| 51-200 | 1,573 | 0.9% |
| 201-1000 | 453 | 0.3% |
| 1001-5000 | 76 | 0.0% |
| 5001+ | 43 | 0.0% |
| Revenue | Companies | Share |
|---|---|---|
| Under $10M | 174,254 | 99.3% |
| $10M-$50M | 932 | 0.5% |
| $50M-$250M | 214 | 0.1% |
| $250M-$1B | 59 | 0.0% |
| $1B+ | 34 | 0.0% |
Share is of companies with a known value — 175,530 with headcount and 175,493 with revenue on file, as of Jul 17, 2026.
Frequently asked questions
How many Healthcare & Life Science in Illinois are there?
There are 175,537 Healthcare & Life Science in Illinois in the directory. Use the filters to narrow by employee count, revenue, or NAICS/SIC code.
How many large companies are in Healthcare & Life Science in Illinois?
231 of the 175,537 companies in Healthcare & Life Science in Illinois employ more than 500 people, and 34 report over $1 billion in annual revenue. See the size and revenue breakdown above for the full distribution.
What size are most Healthcare & Life Science in Illinois companies?
Most are small and mid-sized businesses: the size and revenue tables above show the full spread, from under $10M up to $1B+, across the 175,493 companies with revenue on file.
What information is included for each company?
Every listing includes the company name, location, website, employee size, revenue range where available, and NAICS/SIC classification, with a link to the full profile.
Where does this directory come from?
Listings are compiled and maintained by Factur, a sales and marketing firm for B2B manufacturers. Any company can request an update or removal from its profile page.