Massachusetts: Leominster group pursuing fourth casino region Bruce Mohl, Commonwealth Magazine · June 23, 2022 at 2:55 pm A group of Leominster business officials, with the help of former Senate president and now lobbyist Stan Rosenberg, is pursuing a long-shot, end-of-the-legislative-session bid to create a fourth casino region in Massachusetts in northern Worcester County. Under current state law, there are three casino regions in Massachusetts. The A and B regions are home to Encore Boston Harbor in Everett and MGM Springfield, respectively. Region C in southeastern Massachusetts is currently unoccupied, although the Mashpee Wampanoag Tribe is hoping to open a casino in Taunton. A slots parlor is located at Plainridge Park in Plainville.