Fairfax Financial Customer Service Phone Numbers Customer Service: (800) 857-9641 Customer Service: 1 (517) 308-9408 Investor Relations‎: 416-367-4941   Fairfax Financial Headquarters Info, Email, Phone number, Website and live chat Information Fairfax Financial is a financial holding company based in Toronto, Ontario, which is engaged in property, casualty, and life insurance and reinsurance, investment management, and insurance claims management.