Okla. Stat. tit. 19, § 215.2

Any person, otherwise qualified, who has been a resident of the state for two (2) years, a registered voter in the district and a resident residing within such district for at least six (6) months immediately preceding the filing period, a duly licensed attorney for at least five (5) years, and at least twenty-eight (28) years of age, prior to the date of filing for the office, shall be eligible to hold the office of district attorney. The district attorney shall reside in the district from which the district attorney was elected during the term of office.