N.D. Cent. Code § 40-21-07
A candidate for any public office in an incorporated city may be nominated by filing with the city auditor, before four p.m. on the sixty-fourth day before the holding of the election, a petition signed by not less than ten percent of the number of qualified electors who voted for that office in the last city election. A candidate shall also file a statement of interests as required by section 16.1-09-02. If multiple candidates were elected to the office at the preceding city election at which the office was voted upon, the number of signatures must equal at least ten percent of the total votes cast for all candidates divided by the number of candidates that were to be elected to that office at that election. Qualified electors who sign a petition must reside within the ward or precinct in and for which that officer is to be elected, if the election is by wards, or within the corporate limits of the city, if the officer is elected at large. In cities operating under the commission system of government the required petition may be signed by the qualified electors at large residing within the city. If a petition is mailed, it must be in the possession of the city auditor before four p.m. on the sixty-fourth day before the holding of the election. However, no more than three hundred signatures may be required and the signatures may be on separate sheets of paper. Petitions must meet the specifications of nominating petitions pursuant to section 16.1-11-16. If a city election is not combined with a state or county election according to section 40-21-02, a candidate may be nominated by filing the required petition with the city auditor before four p.m. on the sixty-fourth day before the holding of the election. A candidate may withdraw the candidate's nominating petition at any time before the applicable deadlines for filing nominating petitions provided for in this section. Nominating petitions required by this section may not be circulated or signed prior to January first preceding the election. Any signatures to a nominating petition obtained before that date may not be counted. A nominating petition for a special election may not be circulated or signed more than thirty days before the time when a petition for a special election must be filed. A candidate for city council may run for either the office of mayor or council member but not both in the same election. A candidate for the city commission may run for either the office of city commissioner or the office of president of the board of city commissioners but not both in the same election. A candidate may run for only one office in a city at any given election.
N.D.C.C. § 40-21-07