Where to send your Costco cancellation letter
Read the addresses on this page next to the full guide to cancelling Costco.
The addresses we hold
Every address our database holds for Costco, with the Issaquah one a cancellation letter goes to first and the envelope wording that matches it.
Where the letter goesMailing address
Costco999 Lake DrIssaquah, WA 98027Costco takes its post at this Washington address (ZIP 98027).
How to address the envelope
Copy it exactly onto the envelope
The front of the envelope carries 999 Lake Dr, Issaquah, WA 98027 and nothing else in the address block. Check the 98027 digit by digit before it goes in the post.
Put your own address on it
Top-left, your own name and address. A return address is what the post office needs to send the letter back if Costco has moved.
Send it by certified mail
Certified, not courier: buy it at the counter, keep the postmarked slip, and the letter to Issaquah is traceable from the article number until it is signed for.
Keep the proof together
The postmarked receipt, the tracking record and your signed copy of the letter are the set that proves the request.
The letter to send
What the letter to Costco says: one clear cancellation request, no reasons given, your member number, the name on the membership and the renewal date shown on your latest invoice quoted, and a request for written confirmation.
[Your name] [Your street address] [City, State ZIP] [Your email address]
[Date]
Costco 999 Lake Dr Issaquah, WA 98027
To whom it may concern,
I am cancelling my account with Costco, account or member number [number], with effect from [date or "immediately"]. Please end every add-on and linked plan on this account at the same time.
Please stop all future charges to my payment method, remove my stored payment details, and send written confirmation of the cancellation and its effective date to [your email address].
Sincerely, [Signature] [Your printed name]
Keep reading
The full guide to cancelling this company, our letter template and the postal guides.
Let Postbye cancel Costco for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.