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16,288 companies in Walnut, California.
Find 16,288 companies in Walnut, California. 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 Los Angeles, San Francisco, San Diego.
Of the 16,227 with a known headcount, 97% employ 1-50 people and 10 employ more than 1,000. 98% of those reporting revenue are under $10M, while 4 report more than $1B.
These pages show the first 120 of 16,288 companies. Narrow the list with the filters above or open one of the related lists below to see the rest.
Walnut, California companies by size and revenue
| Employees | Companies | Share |
|---|---|---|
| 1-50 | 15,815 | 97.5% |
| 51-200 | 346 | 2.1% |
| 201-1000 | 56 | 0.3% |
| 1001-5000 | 9 | 0.1% |
| 5001+ | 1 | 0.0% |
| Revenue | Companies | Share |
|---|---|---|
| Under $10M | 15,623 | 97.8% |
| $10M-$50M | 308 | 1.9% |
| $50M-$250M | 31 | 0.2% |
| $250M-$1B | 7 | 0.0% |
| $1B+ | 4 | 0.0% |
Share is of companies with a known value — 16,227 with headcount and 15,973 with revenue on file, as of Jul 17, 2026.
Frequently asked questions
How many companies are in Walnut, California?
16,288 companies in the directory are located in Walnut, California.
How many large companies are in Walnut, California?
20 of the 16,288 companies in Walnut, California employ more than 500 people, and 4 report over $1 billion in annual revenue. See the size and revenue breakdown above for the full distribution.
What size are most Walnut, California 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 15,973 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.