Savings Institute Bank and Trust Company, Portsmouth Branch Basic Info Reviews Routing Numbers Map & Direction Name: Savings Institute Bank and Trust Company, Portsmouth Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 1430 E Main Rd Portsmouth, Rhode Island 02871 Newport County View other branches Phone: 401-643-6000 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer011104283YN011501598YN211174181YY211174301YN211572615YN From: To: