Post Office - Hillsboro 16 1st St Nw Hillsboro, ND 58045 Phone : (701) 436-4221 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (605) 357-4906 United States Government--postal Service 16 1st St Nw Hillsboro, ND 58045 Phone : (701) 436-4221 Business Category Government Offices-Federal Government Offices & Public Schools