N.D. Cent. Code § 40-02-11
If a majority of the votes cast on the question at the election provided for in this chapter favored incorporation as a city, the board of county commissioners that ordered the election shall, if the territory has been incorporated as a city under the council form of government, divide the city into wards. The city may not be divided into wards unless it has more than six hundred inhabitants. If the city has more than six hundred inhabitants, one ward must be formed for each two council members to which the city is entitled. In cities of more than fifteen thousand inhabitants, however, the number of wards is limited to seven originally, and that number may be increased thereafter as provided in this title. Each ward must be formed from contiguous territory, and all wards must be numbered consecutively and must have, as nearly as practicable, the same number of inhabitants. After the election of council members, the governing body of the city shall form or establish wards pursuant to law.
N.D.C.C. § 40-02-11