Go to http://accounts.google.com/signin/usernamerecovery and enter any email accounts or phone numbers that you've had for a while and which may have been used as recovery info. The “find your email” page can help you locate any forgotten Google accounts.

To get started, head to g.co/recover and enter your Gmail address. If possible, try the following to make recovery easier: Use a computer, phone, or tablet you've previously used to sign into your account. Use the same browser that you usually do, like Chrome or Safari.