First National Bank, Southwest Harbor Branch Basic Info Reviews Routing Numbers Map & Direction Name: First National Bank, Southwest Harbor Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 350 Main Street Southwest Harbor, Maine 04679 Hancock County View other branches Phone: 207-244-5594 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer011201762YY011201830YY011202936YN From: To: