Post Office - Casselton 840 Front St Casselton, ND 58012 Phone : (701) 347-4243 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (701) 347-4243 U S Government--postal Service 840 Front St Casselton, ND 58012 Phone : (701) 347-4243 Business Category Government Offices-Federal Government Offices & Public Schools