According to our records, this business is located at 633 W Us Highway 50 in O Fallon (in St Clair County), Illinois 62269, the location GPS coordinates are: 38.5918652 (latitude), -89.951994 (longitude). American Tax Service is categorized under Tax Return Preparation and Filing (SIC code 7291). Current estimates show that the unit has a sales volume of $57,000 and staff of approximately 3 people. You can contact the company by phone at (618) 624-0829.