N.D. Cent. Code § 16.1-07-09
In congressional, state, county, city, or school district elections, if an envelope postmarked or otherwise officially marked by the United States postal service or other mail delivery system before the date of election and containing an absent voter's ballot is received by the officer after election day, the ballot must be tallied by the canvassing board of the county, the governing body of the city, or the school board of the school district, as the case may be, at the time the returns are canvassed. Any envelope without a postmark or other official marking by the United States postal service or other mail delivery system or with an illegible postmark or other official marking and containing an absentee voter's ballot must be received by mail by the proper officer prior to the meeting of the canvassing board. An absent voter may personally deliver the absent voter's ballot to the appropriate officer's office at any time before five p.m. on the day before the election. Any envelope containing an absent voter's ballot with a postmark or official date stamp on the day of election or thereafter may not be tallied with the ballots timely submitted for the election. Before forwarding any ballot to a canvassing board pursuant to this section, the officer forwarding the ballot shall print the date of receipt on the envelope. Upon receipt, the canvassing board shall determine that the elector was qualified to vote in that precinct, that the elector did not previously vote in that precinct on the date of the election, and that the signatures on the absentee ballot application and the voter's affidavit were signed by the same individual before allowing the ballot to be tallied.
N.D.C.C. § 16.1-07-09