Okla. Stat. tit. 11, § 11-29-203: Size of volunteer department

Any municipality having a volunteer fire department shall limit

by ordinance the size of the volunteer fire department to not less

than twelve nor more than twenty-five members for municipalities

with a population of more than one thousand five hundred (1,500); or

not less than eight or more than twenty-five members for

municipalities with a population of eight hundred (800) to one

thousand five hundred (1,500); or not less than six or more than

twenty-five members for municipalities with a population of less

than eight hundred (800). Any municipality having a volunteer fire

department that serves a nine-one-one (911) emergency telephone area

of fifty (50) square miles or more may increase the size of the

volunteer fire department up to an additional five members, with the

total number of members of the volunteer fire department not to

exceed thirty.