How to find a business mailing address for a B2B contact

What do you need to start?

You're looking for where a business publicly says it operates, so first identify the business. Any of these works:

• A work email. The domain (dana@ledgerline.example) points to the company.
• A LinkedIn profile. It names the current employer and often a city.
• A name plus a company or company domain.

The contact's city and state help, since many companies have several offices. Personal mailboxes (gmail.com, outlook.com, internet-provider addresses) name no employer, so researching their domain leads to the email provider.

Where can you find a company's mailing address?

Work through these roughly in order. The closer a source is to the company, the more you can trust it.

1. The company's website. Contact, Locations and About pages, plus the footer, privacy policy and terms, which often list a mailing address.
2. The LinkedIn company page. The About section often lists headquarters and other locations.
3. Google Business listings and maps. Good for branches. Check the listing belongs to the same company.
4. Business directories. Industry and chamber of commerce listings fill gaps for small firms. Confirm them, since they go stale.
5. State business registry filings. Usually searchable online through the Secretary of State. Filings often include a principal office or mailing address, useful for small businesses that publish little else.
6. SEC filings for public companies. An annual report's cover page lists the principal executive offices.

Record where each address came from and the exact text. When sources disagree, the company's website wins, then the most recently updated source.

How do you pick the right office?

• Closest to the contact's city. If the profile says Denver and the company has a Denver office, use it.
• Headquarters as the fallback. Mailrooms there often route mail onward.
• Open beats close. A nearer office that has closed is worse than a farther one that's open.
• The right entity. Subsidiaries, franchises and same-name companies in other states are easy to mix up. Match the name and domain.

What are the red flags?

Don't use people-search sites to find where someone lives. If a sole proprietor publishes a home office as their business address, it's the business's address and fine to mail.

Why verify with USPS CASS before mailing?

An address that looks right can still fail. CASS-certified software standardizes it, adds the ZIP+4, confirms USPS recognizes the delivery point (including the suite) and flags vacancies. Mail only addresses that confirm, check them against your suppression list, and hold the rest. See USPS CASS address verification, explained.

How do you find business addresses at scale?

By hand this takes minutes per contact: fine for twenty people, painful for five hundred. Some habits help:

• Research companies. Thirty contacts at one company need one lookup per office.
• Sort by company and city so each office is researched once.
• Keep a source link per address so review is fast.
• Verify in one pass and work the holds as a queue.

Mailyard automates this. Upload work emails, LinkedIn profiles or names with companies. Research checks where each company publicly says it is, prefers the office closest to the contact's city and falls back to headquarters, with the source links and quoted text shown for each address. USPS CASS checks it, and anything unconfirmed is held with a reason. Contacts at the same company and place share one lookup, and a credit is used only for a verified, mailable result.

FAQ