How do you find a credit card company to cancel your account when they may not be in business or have changed names?

I don't know of any ligitimate credit card company that would go out of business and they would usually notify their customers of any company name. Go on: google.com Put in the name of your Credit Card Company and either it will have a contact for you to reach them at and also any information as to whether there has been a company name change. Marcy