Since its founding in 1913, St. Mary's Credit Union has offered an alternative to traditional banks. As a credit union, St. Mary's members own the credit union - and therefore every decision we make is based upon the best interests of our member/owners. Until recently, St. Mary's Credit Union primarily served the residents of Marlborough and surrounding towns. Today, utilizing the benefits of technology and electronic delivery channels, St. Mary's is able to offer the benefits of membership to a much broader geographic region that includes all of Middlesex and Worcester counties.