Okla. Stat. tit. 10A, § 2-2-401
In adjudicatory hearings to determine if a child is delinquent or in need of supervision, any person entitled to service of summons or the state shall have the right to demand a trial by jury, which shall be granted as in other cases, unless waived, or the judge on the judge's own motion may call a jury to try any such case. Such jury shall consist of six persons.
Laws 1995, HB 1978, c. 352, § 124, emerg. eff. July 1, 1995; Renumbered from 10 O.S. § 7303-4.1 by Laws 2009, HB 2029, c. 234, § 180, emerg. eff. May 21, 2009.