Post Offices in & near Alton, Illinois. Operating hours, locations, phone/fax number, services information.
Upper Alton Post Office in Alton, Illinois on Main St. Operating hours, phone number, services information, and other locations.
Address: 1624 Main St, Alton, IL 62002
Phone: 618-462-6014
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457
