Okla. Stat. tit. 19, § 19-868.16: Amendment of zoning regulations

The regulations imposed and the districts created under

authority of this act may be amended from time to time by the board

of county commissioners by order after the order establishing the

same has gone into effect, but no such amendment shall be made

without a hearing before the county planning commission. In case of

written protest against any proposed amendment, signed and

acknowledged by the owners of twenty percent (20%) of the frontage

within one thousand (1,000) feet to the right or left of the

frontage proposed to be changed, or by the owners of twenty percent

(20%) of the frontage directly opposite, or directly in the rear of

the frontage proposed to be altered, or, in cases where the land

affected lies within one and one-half (1 1/2) miles of the limits of

a municipality, by the governing body of the zoned municipality,

filed with the county planning commission, such amendment may not be

passed except by the favorable vote of all members of the board of

county commissioners.