First Bank of Ohio, Marietta Branch Basic Info Reviews Routing Numbers Map & Direction Name: First Bank of Ohio, Marietta Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 320 Front Street Marietta, Ohio 45750 Washington County View other branches Phone: 740-373-9404 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer041202540YN044202466YN From: To: