Post Office - Hawthorne 7204 S Wisconsin Ave Hawthorne, WI 54842 Phone : (715) 374-2737 Post Office - Hawthorne Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Offices, Hawthorne 7204 S Wisconsin Ave Hawthorne, WI 54842 Phone : (715) 374-2737 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools