Westminster Branch, Anderson, Bagley & Mayo Insurance Agency, Inc. Westminster Branch, Anderson, Bagley & Mayo Insurance Agency, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Advertising & Media >> Finance and Insurance >> Insurance Company Westminster Branch, Anderson, Bagley & Mayo Insurance Agency, Inc. P.O. Box 360Leominster, MA 01453 (978) 534-2800