Definition: Allstate Insurance Company Phone Number: Allstate Insurance Company's main office is located in Charlotte, North Carolina, with additional locations across the United States. The Allstate Insurance Company phone number is 919-842-3675. This is a toll-free telephone number that customers can use to contact customer service for any questions or concerns they may have about their insurance coverage. The definition of "Allstate Insurance Company" in this context refers to the company itself, which is a division of Allstate Corporation and headquartered in Charlotte, North Carolina. The phone number provides access to customer support services, including claims processing, policy assistance, and claims management.