North Dakota Constitution Art. II, § 1

The general election of the state shall be held biennially as provided by law.

Only a citizen of the United States, who has attained the age of eighteen years and who is a North Dakota resident, shall be a qualified elector.  When an elector moves within the state, he shall be entitled to vote in the precinct from which he moves until he establishes voting residence in another precinct.  The legislative assembly shall provide by law for the determination of residence for voting eligibility, other than physical presence.  No elector shall lose his residency for voting eligibility solely by reason of his absence from the state.

The legislative assembly shall provide by law for secrecy in voting, for absentee voting, for administration of elections and for the nomination of candidates.