If you are interested in cancelling your AOL service you will need to either contact the company by phone, mail or fax to cancel your account. If calling by phone the number is 888-265-8008. The mailing address is AOL, PO Box 65100, Sterling VA 20165-8800. The fax number is 703-433-7283. Be sure you provide your full name, address, AOL account id and last four digits of your credit card they are billing to.