Cancel your Costco subscription by mail
Directly with Costco, the way to cancel is: In person at membership counter or phone. Letters to Costco go to Issaquah, United States.
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.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Costco.
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- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Costco by mail
Note your account details
Check your member number, the name on the membership and the renewal date shown on your latest invoice before anything else. A request that does not match the account on file at Costco is the easiest one to set aside.
Write the cancellation request
Postbye turns the request into a finished English letter headed “Subject: Subscription termination – Costco”: close the Costco account, stop every charge and reply in writing.
Post it with proof of delivery
Mail the letter by certified mail to the Issaquah address in the next section, and keep the tracking number.
Keep the proof of delivery
File the receipt with the letter. A Costco charge dated after delivery is the one to dispute, and these two documents are what you quote.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Costco cancellation letter goes
Costco lists 999 Lake Dr, Issaquah, WA 98027 as its mailing address.
Put ZIP 98027 on the envelope: Issaquah is in Washington, and a domestic certified letter is all it takes.
Inside, the salutation reads “To Whom It May Concern,”, followed by your details under Name, Address and E-mail.
Prefer to write it yourself? Use our letter template
Before you cancel Costco, check these
- Primary Member only; warehouse counter gives immediate refund
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
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.
Cancelling a membership
Memberships renew on the anniversary of joining and may be cancelled at a counter, online or in writing depending on the organisation, so a written request names the member number and the end date.
Putting the request in writing means there is a date on file for when you asked, which matters if a charge appears afterwards.
Costco lets you cancel directly (in person at membership counter or phone). A letter is the fallback that leaves a dated record when the direct route fails.
Costco cancellation at a glance
- How Costco accepts cancellations
- In person at membership counter or phone
- Mailing address on file
- Costco 999 Lake Dr Issaquah, WA 98027
- Country
- United States
- Letter language
- English (template en)
- Phone
- 1-800-774-2678
- Category
- Memberships & clubs
- Checked against
- Verified on
