According to our records, this business is located at 705 E State St. in O Fallon (in St Clair County), Illinois 62269, the location GPS coordinates are: 38.591673 (latitude), -89.895865 (longitude). Swi Inc is categorized under Construction Sand and Gravel (SIC code 1442). Known organization president is Tina Hoover. You can contact the company by phone at (618) 632-6897.