What is the toll free number for nationwide insurance? Nationwide Car Insurance toll free customer service number : 1-877-669-6877. Nationwide Travel Insurance toll free customer service number : 0845 246 1692.What is the mailing address for nationwide insurance? The address of Nationwide Life Insurance is One Nationwide Plaza Columbus, Ohio 43215-2220, United States.What is a naic number for nationwide? NAIC Number: 23760. Nationwide General Insurance Company. 1000 Nationwide Drive, P.O. Box 2655. Harrisburg, PA 17105. Source: New York State Department of Financial Services.What is the phone number for nationwide insurance? The customer support phone number of NationWide Insurance is 1-800-882-2822 (Click phone number to call).