According to our records, this business is located at 400 S Lincoln Ave. in O Fallon (in St Clair County), Illinois 62269, the location GPS coordinates are: 38.5889042 (latitude), -89.9107798 (longitude). Mercantile Bank is categorized under Banks (SIC code 6021). Current estimates show that the unit has a sales volume of $2,408,000 and staff of approximately 8 people. You can contact the company by phone at (618) 632-3615.