Costco Wholesale Canada

For all Costco credit card inquiries, we’re here to assist you.

Online and Mobile Banking

Sign in to online banking or download the Capital One® Mobile Banking app to access your account on the go.

Don’t have an Account?

Sign up now.

On Twitter

Available Monday to Friday, 8 a.m.-9 p.m.
Saturday to Sunday, 10 a.m.-6 p.m. ET

Ask us a question on Twitter

Customer Service

Toll-free within Canada and the U.S.

Outside of Canada or the U.S. Call us collect.

General Correspondence

Capital One Customer Service
P.O. Box 500, Stn. D
Scarborough, ON
M1R 0C2


Mail your payment to:
Capital One
P.O. Box 4566, Stn. A
Toronto, ON
M5W 0H9

(Be sure to write your 16-digit account number on your cheque or money order.)

Dispute A Charge

If you believe you were charged for a transaction you didn't make, please contact us to dispute the charge. Sign in to or mail us at the following address:

Attn: Merchant Resolution
P.O. Box 845
Stn. Agincourt
Scarborough, ON
M1S 0M9

Phone: 1-800-966-6030
Fax: 1-855-610-0645

Payment Investigations

If you've made a payment that doesn't show up on your account, or you made a payment to the wrong account, please contact us:

Capital One Customer Service
Attn: Payment Investigations
P.O. Box 4908
Scarborough Stn. D
Scarborough, ON
M1R 4Y8

Online Phishing

If you believe you've received a phishing email that claims to be from Capital One, forward the suspicious email to

You can also forward it to (English Only).

Not A Member?

Go to to sign up to become a Costco member.

®† Registered trademark of Price Costco International, Inc. used under license.