Mercantile Bank of Michigan, St. Helen Branch Basic Info Reviews Routing Numbers Map & Direction Name: Mercantile Bank of Michigan, St. Helen Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 2040 North St. Helen Road St. Helen, Michigan 48656 Roscommon County View other branches Phone: 989-389-1311 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer072402665YY072403211YY072404650YY072404757YY072408892YN072413227YY072413816YY072413829YY072414022YY From: To: