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Start with the company's contact page, then check the address it gives for correspondence, because the headquarters address and the address that receives mail are often different. If the contact page gives no mailing address, work outward: the company's SEC filings, its state business registration, and a direct phone call, in that order.
| Source | Best for | Watch out for |
|---|---|---|
| Company contact page | Every company, first stop | Many list only a form or email; scroll to the footer for a postal address |
| SEC EDGAR filings (10-K) | US public companies | The 10-K lists principal executive offices, which may not accept mail |
| State business registry | Any registered business | Shows the registered agent's address, not the mailroom |
| Google Maps / business profile | Local businesses | Shows the storefront, which is fine for local shops |
| Calling the company | Any company, when it matters | Ask specifically for the mailing address for correspondence, not the street address |
Big companies route mail through processing centers that have nothing to do with where the executives sit. A letter to "headquarters" lands in a general mailroom and gets sorted by hand; a letter to the published correspondence address goes straight to the department that opens that kind of mail. Customer complaints, legal notices, and partnership inquiries each have their own destination. When a contact page lists a separate address for media, legal, or customer service, use it: that specificity is the difference between a same-week reply and a letter that circulates internally for a month.
Every state's business registry shows a registered agent: the person or company authorized to receive legal papers on the business's behalf. That address is public and easy to find, but it is for service of process, not general correspondence. Sending a sales pitch or a complaint to the registered agent means it goes to a law firm or a filing service, where it will be treated as what it is: misdirected. Use the registered agent address only for legal notices. For everything else, find the address the company itself publishes for mail.
Three checks, in order. First, confirm the address appears on the company's own website, not just on a directory or review site: third-party listings go stale. Second, confirm it is a mailing address, not a street address. A street address tells you where the building is; a mailing address tells you where the letter goes. Third, for anything with legal weight, call and confirm: a two-minute phone call beats a returned letter by two weeks. Ask for the department or attention line while you have them on the phone.
Some online-only businesses publish no postal address, which is legal in most cases but tells you something about how they handle paper mail. Try their investor-relations page (public companies must disclose), the copyright or DMCA agent listing (required on US sites), or the terms-of-service page, which sometimes includes a notice address. If none of those yield anything, the registered agent address from the state registry is your fallback for formal matters. And if a company is completely unreachable by mail, treat that as information: a business with no published address is a business you may not want to send money to.
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