Okla. Stat. tit. 26, § 26-14-141: Voting registration - Federal postcard application

A. To apply to register to vote, in addition to any other

approved method, a covered voter may use a federal postcard

application, or the application’s electronic equivalent.

B. A covered voter may use the declaration accompanying a

federal write-in absentee ballot to apply to register to vote

simultaneously with the submission of the federal write-in absentee

ballot. Such application shall be processed as provided in Section

4-110.1 of Title 26 of the Oklahoma Statutes.

C. The Secretary of the State Election Board shall ensure that

the electronic transmission system described in subsection C of

Section 4 of this act is capable of accepting both a federal

postcard application and any other approved electronic registration

application sent to the appropriate election official. The voter

may use the electronic transmission system or any other approved

method to register to vote.