Costco Contact Information

• Mon - Fri: 5am - 8pm PT
• Sat - Sun: 5am - 7pm PT

Additional phone numbers

See all Costco phone numbers

Unfortunately, we were unable to locate an email address for Costco customer support. Please consider using one of the other contact options provided on this page to get in touch with the Costco.

• Costco
• PO Box 34331
• Seattle
• WA
• US
• 98124

Tip When should i write a letter to get in touch with Costco?

For complex issues that require additional (physical) documentation, sending a letter to Costco is usually the best way of communicating. This will allow you to clearly and thoroughly articulate your problem or question and provide any necessary documents. When sending documents by mail, it's important to provide copies rather than the original documents.

To ensure that your letter arrives safely and to keep track of its delivery, send it via registered mail. This type of delivery is more reliable and enables you to track the progress of your letter from start to finish.

Tip Protect your privacy when using social media to contact Costco!

If you have a sensitive or a confidential issue to discuss with Costco (or any other company/authority), it may be better to contact Costco through a more private channel, such as by phone or email because social media is a public platform, your message may be seen by other users.

Be sure to not to mention private details such as:

• Your address
• Your phone number
• Your credit card or bank account number
• Your password(s)

• It allows Costco to improve their products or services. Costco rely on customer feedback to make improvements.
• It helps Costco to understand their customers better. Feedback can provide valuable insights into your needs and preferences.
• It can help you to build a relationship with Costco. Companies appreciate customers who take the time to provide feedback, and may be more likely to respond positively.
• It can also help to identify and solve problems. Feedback can help Costco to identify issues with their products or services, and take steps to fix them.

Costco Wholesale Corporation is an American multinational corporation which operates a chain of membership-only big-box warehouse club retail stores. As... Read more on Wikipedia.

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