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14,350 companies in O Fallon, Missouri.
Find 14,350 companies in O Fallon, Missouri. 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 St. Louis, Kansas City, Springfield.
O Fallon, Missouri companies by size and revenue
| Employees | Companies | Share |
|---|---|---|
| 1-50 | 14,206 | 99.0% |
| 51-200 | 108 | 0.8% |
| 201-1000 | 26 | 0.2% |
| 1001-5000 | 4 | 0.0% |
| 5001+ | 0 | 0.0% |
| Revenue | Companies | Share |
|---|---|---|
| Under $10M | 14,222 | 99.2% |
| $10M-$50M | 101 | 0.7% |
| $50M-$250M | 9 | 0.1% |
| $250M-$1B | 1 | 0.0% |
| $1B+ | 0 | 0.0% |
Share is of companies with a known value — 14,344 with headcount and 14,333 with revenue on file, as of Jul 17, 2026.
Frequently asked questions
How many companies are in O Fallon, Missouri?
14,350 companies in the directory are located in O Fallon, Missouri.
How many large companies are in O Fallon, Missouri?
5 of the 14,350 companies in O Fallon, Missouri employ more than 500 people. See the size and revenue breakdown above for the full distribution.
What size are most O Fallon, Missouri 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 14,333 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.