United States Government--post Offices, Hanover Freeport, IL 61032 Phone : (815) 591-2219 Business Category Post Offices Government Offices & Public Schools Post Office - Hanover 220 Jefferson St Hanover, IL 61041 Phone : (815) 591-2219 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (815) 591-3749