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13,285 companies in South San Francisco, California.
Find 13,285 companies in South San Francisco, 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 13,143 with a known headcount, 97% employ 1-50 people and 10 employ more than 1,000. 97% of those reporting revenue are under $10M, while 18 report more than $1B.
These pages show the first 120 of 13,285 companies. Narrow the list with the filters above or open one of the related lists below to see the rest.
South San Francisco, California companies by size and revenue
| Employees | Companies | Share |
|---|---|---|
| 1-50 | 12,759 | 97.1% |
| 51-200 | 294 | 2.2% |
| 201-1000 | 80 | 0.6% |
| 1001-5000 | 5 | 0.0% |
| 5001+ | 5 | 0.0% |
| Revenue | Companies | Share |
|---|---|---|
| Under $10M | 12,359 | 96.6% |
| $10M-$50M | 350 | 2.7% |
| $50M-$250M | 59 | 0.5% |
| $250M-$1B | 10 | 0.1% |
| $1B+ | 18 | 0.1% |
Share is of companies with a known value — 13,143 with headcount and 12,796 with revenue on file, as of Jul 17, 2026.
Frequently asked questions
How many companies are in South San Francisco, California?
13,285 companies in the directory are located in South San Francisco, California.
How many large companies are in South San Francisco, California?
31 of the 13,285 companies in South San Francisco, California employ more than 500 people, and 18 report over $1 billion in annual revenue. See the size and revenue breakdown above for the full distribution.
What size are most South San Francisco, 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 12,796 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.