If you have an online Costco account, you can log in at https://www.costco.com/LogonForm.
The login page will look like this:
- Costco gives you everything you need on its login page. If you have forgotten your Costco.com password, you can reset it on the login page. If you need to register for an online account, you can do that on the login page, too.
- If you are still having trouble logging in, the Costco.com customer service phone number is 800-955-2292.