From Ballotpedia
Section 5 of Article V of the Oklahoma Constitution is called Reservation of Powers to Voters of Counties and Districts - Manner of Exercising. It says that "The powers of the initiative and referendum reserved to the people by this Constitution for the State at large, are hereby further reserved to the legal voters of every county and district therein, as to all local legislation, or action, in the administration of county and district government in and for their respective counties and districts. The manner of exercising said powers shall be prescribed by general laws, except that Boards of County Commissioners may provide for the time of exercising the initiative and referendum powers as to local legislation in their respective counties and districts."
Section 5 of Article 5 goes on to say that as far as the number of signatures required to qualify a local ballot initiative, "The requisite number of petitioners for the invocation of the initiative and referendum in counties and districts shall bear twice, or double, the ratio to the whole number of legal voters in such county or district, as herein provided therefor in the State at large."
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