Amgen Inc. head office mailing address
To mail a letter to Amgen Inc., a biotechnology company, send it to the company's head office at Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320. This is Amgen Inc.'s publicly listed corporate head office — the right address for written correspondence, feedback, and formal notices. Add your return address if you'd like a reply, and confirm the address on the company's official contact page before anything time-sensitive.
Amgen Inc. — head office
Amgen Inc. One Amgen Center Drive Thousand Oaks CA 91320
Written correspondence, customer feedback, and formal notices to the company. This is the corporate head office — not a store, branch, or service centre.
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Your return address
Amgen Inc.One Amgen Center DriveThousand Oaks, CA 91320
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Key facts
- This is Amgen Inc.'s corporate head office address, taken from the company's own contact page.
- Amgen Inc. is a biotechnology company.
- Use it for letters, feedback, and formal written notices — not for parcels or in-store returns.
- Head offices relay mail internally; an attention line (e.g. "Customer Relations") helps it land in the right place.
- Include your return address and any reference number so the company can respond.
- PostPal prints your letter and mails it for you — no printer, envelope, stamps, or post office trip.
How to send your letter
- 1
Decide who your letter is for
A letter to the head office reaches the company generally. If it's for a particular team, add an attention line such as "Attention: Customer Relations" or "Office of the President" so it's routed faster.
- 2
Write your letter
Keep it clear and factual. Include any account, order, or reference number, the outcome you're looking for, and your return address so the company can write back.
- 3
Address it to the head office
First line: Amgen Inc.. Then the street: One Amgen Center Drive. Then the city line: Thousand Oaks CA 91320.
- 4
Send it with PostPal
Write or upload your letter to PostPal with the address above prefilled. We print it, add your return address, and mail it for you — no printer, envelope, stamps, or trip to the post office.
Common questions
What does Amgen Inc. do?
Amgen Inc. is a biotechnology company. The address above is its corporate head office — the right place for written correspondence, customer feedback, and formal notices.
What is Amgen Inc.'s head office mailing address?
Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320. It's the company's publicly listed corporate head office — the right address for written correspondence, feedback, and formal notices. Confirm it on Amgen Inc.'s official contact page before anything time-sensitive.
Will someone actually read my letter or write back?
Head offices route incoming mail to the relevant team, so a letter to the corporate address does get handled — but a personal reply isn't guaranteed. Including your return address, an account or reference number, and a clear request gives you the best chance of a response.
Is this a store or branch address?
No — this is Amgen Inc.'s corporate head office. For something tied to a specific location, contact that store or branch directly; use the head office for company-wide correspondence and formal notices.
Can I mail documents or a formal notice here?
Yes — you can send letters and printed documents to the head office. If you're formally serving legal documents, a company may designate a separate registered or legal address, so check its official filings first.
How do I mail Amgen Inc. a letter without a printer?
Write or upload your letter to PostPal with the address prefilled. We print it, add your return address, and mail it for you — no printer, stamps, or post office trip needed.
Sources
Addresses verified August 2026 against official sources. Always confirm on the official site before time-sensitive filings.