Main Source Bank Address: 108 E State St, Potomac, IL 61865 Phone: (217) 987-6125 Hours: Mon: 9am-5pm Tue: 9am-5pm Wed: 9am-5pm Thu: 9am-5pm Fri: 9am-5pm Banks, Insurance Other Businesses: Gifford State Bank at 108 E State St, Potomac, IL 61865 Casey's General Store at 100 E State St, Potomac, IL 61865 Artesian Cafe at 316 W State St, Potomac, IL 61865