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16,659 companies in Northbrook, Illinois.
Find 16,659 companies in Northbrook, Illinois. From manufacturers to industrial suppliers, each listing carries the firm's address, website, size, and NAICS/SIC codes. You can also browse nearby cities such as Chicago, Naperville, Rockford.
Northbrook, Illinois companies by size and revenue
| Employees | Companies | Share |
|---|---|---|
| 1-50 | 16,044 | 97.1% |
| 51-200 | 362 | 2.2% |
| 201-1000 | 88 | 0.5% |
| 1001-5000 | 10 | 0.1% |
| 5001+ | 11 | 0.1% |
| Revenue | Companies | Share |
|---|---|---|
| Under $10M | 15,677 | 97.4% |
| $10M-$50M | 315 | 2.0% |
| $50M-$250M | 82 | 0.5% |
| $250M-$1B | 14 | 0.1% |
| $1B+ | 10 | 0.1% |
Share is of companies with a known value — 16,515 with headcount and 16,098 with revenue on file, as of Jul 17, 2026.
Frequently asked questions
How many companies are in Northbrook, Illinois?
16,659 companies in the directory are located in Northbrook, Illinois.
How many large companies are in Northbrook, Illinois?
44 of the 16,659 companies in Northbrook, Illinois employ more than 500 people, and 10 report over $1 billion in annual revenue. See the size and revenue breakdown above for the full distribution.
What size are most Northbrook, 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 16,098 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.