Okla. Stat. tit. 19 § 1264
Upon the filing of a petition with the board of county commissioners for a change in boundaries of any road improvement district, signed by a majority of the assessed members of the existing road improvement district, the board of county commissioners shall cause notice to be published one time in a newspaper printed and published in the county and of general circulation in the area sought to be annexed, at least ten (10) days before the time at which such petition will be heard. Such notice shall state the time and place when and where the petition will be heard by the board of county commissioners, a brief substance of the petition and that all persons interested may appear and be heard. The board of county commissioners shall have exclusive jurisdiction to hear and determine all contests and objections pertaining to such annexation. At such hearing the board of county commissioners shall also determine whether or not the annexation of such area to such road improvement district will be to the best interests of the residents of the area affected, or beneficial to the public health and welfare of said area as now exists, or to be developed, and if said board of county commissioners determines that it will, then the board of county commissioners shall make an order annexing such area to said road improvement district, and such territory for all purposes shall thereafter be a part of the road improvement district. The annexed territory shall assume its proportion of all legal indebtedness outstanding against the original road improvement district, including bonded indebtedness.
Okla. Stat. tit. 19, § 1264