Address of Great Lakes Student Loans The address of the Great Lakes Student Loans is Great Lakes, PO Box 7860 Madison, WI 53707-7860, Wisconsin, United States you can go through with this address detail for contacting Great Lakes Student Loans for their queries. Phone number of Great Lakes Student Loans: you can contact Great Lakes Student Loans via telephone or mobile phone as shown below Great Lakes Student Loans phone number : (800) 236-4300, (608) 246-1700