For computing mileage and per diem, a special judge shall be deemed a resident judge of the district court of the county whose population authorized his or her appointment. For computing mileage and per diem, a court reporter or secretary-bailiff shall be deemed a resident of the district court of the county to which he or she is initially assigned by the Presiding Judge or Chief Justice.
Okla. Stat. tit. 20, § 4