Okla. Stat. tit. 10, § 10-116: County probation officer - Counties having population of

190,000 or more and city of 100,000 or more.

In each county of this state having a population of one hundred

ninety thousand (190,000) or more and containing a city of one

hundred thousand (100,000) population or more, as shown by the last

Federal Decennial Census or any future Federal Decennial Census,

there is hereby created the office of probation officer, who shall

be a county officer charged with the supervision and care of the

parolees of such county, and who shall maintain an office in the

county building of that county.