United States Government--labor Department Of, Postal Service, Hamilton Cavalier, ND 58220 Phone : (701) 265-8276 Business Category Government Offices-Federal Government Offices & Public Schools United States Government--hamilton Cavalier, ND 58220 Phone : (701) 265-8276 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Hamilton 402 Page Ave Ste A Hamilton, ND 58238 Phone : (701) 265-8276 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (605) 357-4906