U S Government--post Offices, Warren Warren, IL 61087 Phone : (815) 745-2139 Business Category Post Offices Government Offices & Public Schools United States Government--post Offices, Warren Freeport, IL 61032 Phone : (815) 745-2139 Business Category Post Offices Government Offices & Public Schools Post Office - Warren 101 E Main St Warren, IL 61087 Phone : (815) 745-2139 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (815) 745-3806