Oklahoma voters who wish to cast ballots in the Aug. 26 primary runoff election have until Friday to register to vote.

Oklahoma State Election Board Secretary Paul Ziriax (ZEER’-iks) says voters can download a registration form from the agency’s website or pick one up at county election boards, post offices, tag agencies or libraries. Voters must either register in person by the close of business Friday or have their registration form postmarked by the deadline.