Okla. Stat. tit. 11 § 27-119
In all prosecutions in the municipal court for any offense for which the municipality, with the concurrence of the court, seeks imposition of a fine of more than Five Hundred Dollars ($500.00), excluding court costs, or imprisonment, or both such fine and imprisonment, a jury trial shall be had unless waived by the defendant and the municipality, provided that the municipality has compiled its penal ordinances in accordance with the provisions of Sections 14-109 and 14-110 of this title. If the municipality has not compiled its ordinances as provided by law, the fine shall not exceed Fifty Dollars ($50.00). In prosecutions for all other offenses, or in cases wherein a jury trial is waived by the defendant and the municipality, trial shall be to the court. A jury in the municipal court shall consist of six (6) jurors, five of whom may return a verdict. Jurors shall be good and lawful men or women, citizens of the county in which the court sits, having the qualifications of jurors in the district court.
Okla. Stat. tit. 11, § 27-119