T-Mobile US, Inc. head office mailing address
To mail a letter to T-Mobile US, Inc., a wireless carrier, send it to the company's head office at T-Mobile US, Inc., 12920 SE 38th Street, Bellevue, WA 98006. T-Mobile US is a wireless network operator. This is T-Mobile US, 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.
T-Mobile US, Inc. — head office
T-Mobile US, Inc. 12920 SE 38th Street Bellevue WA 98006
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
T-Mobile US, Inc.12920 SE 38th StreetBellevue, WA 98006
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Key facts
- This is T-Mobile US, Inc.'s corporate head office address, taken from the company's own contact page.
- T-Mobile US, Inc. is a wireless carrier, best known for brands like T-Mobile and Metro by T-Mobile.
- 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: T-Mobile US, Inc.. Then the street: 12920 SE 38th Street. Then the city line: Bellevue WA 98006.
- 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 T-Mobile US, Inc. do?
T-Mobile US is a wireless network operator. Its brands include T-Mobile and Metro by T-Mobile. The address above is its corporate head office — the right place for written correspondence, customer feedback, and formal notices.
What is T-Mobile US, Inc.'s head office mailing address?
T-Mobile US, Inc., 12920 SE 38th Street, Bellevue, WA 98006. It's the company's publicly listed corporate head office — the right address for written correspondence, feedback, and formal notices. Confirm it on T-Mobile US, 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 T-Mobile US, 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 T-Mobile US, 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.