Okla. Stat. tit. 19, § 19-901.25a: Inclusion of contiguous districts

When the respective territories of any city or town and any

district are contiguous they may be included in the limits of the

district in the same manner as provided for the organization of fire

protection districts. Such territory shall not be included or added

to the territory of the district without the consent of the board of

directors, certified to the board of county commissioners. In case

any such territory is added to the district the property therein

shall immediately become subject to the lien for the payment of

bonds theretofore authorized by the district in the same manner as

property within the district at the time of authorization of such

bonds.