Western Reserve Group P.O. BOX 740754 Cincinnati OH 45274-0754 To pay by phone (24 hours/day, 7/days a week) - Call the Western Reserve Group Billing Information System at (800-362-0426), and follow the prompts. To pay online (24 hours/day, 7/days a week) - Click the button below to enter the Pay by Web site and make a payment online..