Okla. Stat. tit. 65, § 159

The governing body of any other city or town in any county is authorized to contract with the city-county library commission, subject to the approval of the governing body of the city and the board of county commissioners, to bring such other city or town into the city-county library system, upon such terms as may be mutually agreed upon, and for that purpose may lease to the city-county library commission any library facilities or property which such other city or town may own, may include in its annual budget appropriations for participation in the city-county library system, and shall pay over to the city-county library system funds so appropriated.