MLS Property Information Network Founded in 1997, MLS Property Information Network (MLS PIN) is one of the largest Realtor-owned multiple listing services in the nation. Based in Shrewsbury, MA., the MLS PIN database displays around 29,000 properties across Massachusetts, Rhode Island, and much of New Hampshire, covering much of the New England region. MLS PIN … Continue reading Add MLS PIN Listings to Your Site – The Leading IDX Plugin