Hillary won exactly 2 of the 53 counties - Rolette with 2099 votes (57%), and Sioux with 798 votes (64%)... Sioux County is famous for the months-long DAPL Pipeline "protest", by the way.
(Gary Johnson got 6.4% in ND, as well.)
Bernie also beat Hillary among district delegates in NoDak, 253-101 (64%-25%, 10% uncommitted)
My late mother grew up in Rolette County; it is the home of the Turtle Mountain Indian Reservation. I believe Sioux County also has a reservation.