The Citizens State Bank of Ontonagon, Mass Branch Basic Info Reviews Routing Numbers Map & Direction Name: The Citizens State Bank of Ontonagon, Mass Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 1305 Adventure Avenue Mass City, Michigan 49948 Ontonagon County View other branches Phone: 906-883-3405 Please enable JavaScript to view the comments powered by Disqus. From: To: