D.C. Mun. Regs. tit. 3, § 716
716.1 A written request for a mail absentee ballot shall be received from the registered voter by no later than the seventh (7th) day preceding the day of the election and shall include the following:
716.2 If an applicant qualified to vote by absentee mail provides a residence address that is different from the residence address listed on the Board's records, the application to vote absentee shall be considered a request for a change of address to the Board and the voter shall be issued a ballot for the current residence address.
716.3 All mailed absentee ballots shall be postmarked not later than the day of the election; provided, that ballots received from overseas in franked envelopes need not be postmarked.
716.4 All mailed absentee ballots shall be received by the Board not later than ten (10) days after the day of the election in order for the absentee ballot to be counted.
716.5 A registered voter may request absentee ballots, by mail, for all elections in the current calendar year.
SOURCE: Final Rulemaking published at 39 D.C. Reg. 2467, 2491-92 (April 10, 1992); Amendment to Final Rulemaking published at 51 D.C. Reg. 7416 (July 30, 2004); and as amended by Final Rulemaking published at 56 D.C. Reg. 5753, 5756 (July 17, 2009).