Us Government--postal Service, Franklin Grove Franklin Grove, IL 61031 Phone : (815) 456-2132 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Franklin Grove 113 S Elm St Franklin Grove, IL 61031 Phone : (815) 456-2132 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (815) 456-2918