Okla. Stat. tit. 14, § 80.8

To file as a candidate for the State Senate in any senatorial district, a person must have been a registered voter in the district and a resident residing within such district for the six-month period immediately preceding the first day of the filing period as provided by law. Any member of the Senate whose district has been changed by redistricting may change residence with the intent of becoming qualified to seek reelection in such district in the first election applicable to such district following redistricting without thereby being deemed to have vacated his or her existing office.