Mary Fant Donnan won by a two-to-one margin.
With all 100 counties reporting, Donnan has 43,217 votes, or 68 percent. Former labor commissioner John C. Brooks has 20,445, or 32 percent. She now faces incumbent Republican Cherie Berry in November.
Turnout was a paltry 1.9 percent.
In a runoff for the Democratic nomination in state Senate District 5, Don Davis beat Kathy Taft, 63 percent to 37 percent. The seat is currently held by retiring Democratic Sen. John Kerr III.
Davis, the mayor of Snow Hill, had slightly edged Taft, a member of the State Board of Education, in a six-way race in the May primary, but failed to garner a majority. He now faces four-term Rep. Louis Pate, a Wayne County Republican.
And in a runoff for the Republican nomination in state House District 67, Justin Burr defeated Rep. Ken Furr, 58 to 42 percent. Burr had slightly edged Furr in a three-way race on May 6.