Okla. Stat. tit. 11 § 30-102
The municipal governing body may, in its discretion and by ordinance, place the exclusive management and control of the municipal hospital under a board of control of five (5) members, chosen by the governing body from the citizens of any school district which is part of the municipality with reference to their fitness for such office. The members of the board of control shall hold office for a term of five (5) years from the first day of May following their appointment, and their terms shall be staggered. At the first regular meeting of the board, the members shall cast lots for respective terms of one year, two years, three years, four years, and five years; thereafter the terms of all members shall be five (5) years. Vacancies in the board of control shall be filled in the same manner as original appointments.
Okla. Stat. tit. 11, § 30-102