(a) Generally. At any time subsequent to the designation of a state planning and development district pursuant to Section 11-85-51, governmental units within the district acting through their governing bodies by ordinance or resolution may adopt a written agreement for the formation of a regional planning and development commission and may petition the Governor to certify such a commission for a region located entirely within a state planning and development district and consisting of at least three contiguous counties and containing a population of at least 100,000. Governmental units so petitioning must represent at least a majority of the population within the proposed region. No county shall be divided in forming a region. The Governor may, after consultation with the governing bodies of the governmental units involved, amend petitions to include additional counties to assure that the objectives of this article are furthered and that no county or city will be precluded from participation in a regional planning and development commission.
(b) Bistate or multistate commissions. In case two or more governmental units determine that the geographical area embraced by such units, although not meeting the minimum criteria prescribed in subsection (a) of this section, is logically, for planning and development purposes, a part of a larger area which extends into an adjoining state or states, such governmental units may adopt an agreement for the formation of a regional planning and development commission and may petition the Governor to certify such commission for the proposed region. The Governor may, after consultation with the governmental units which are parties to the petition and after approval by him of an appropriate interstate agreement or compact certify the commission. In such case the Governor may authorize such deviations from the minimum requirements for area and population prescribed in Section 11-85-51 and subsection (a) of this section and the requirements for composition of the commission prescribed in Section 11-85-53 as may be necessary to conform to the interstate agreement or compact. No county shall be divided in applying the provisions of this subsection.
(c) Single county commissions. Regional planning and development commissions may be formed in any county having a population between 93,000 and 100,000 persons according to the most recent federal decennial census in the same manner as any other state planning and development district; provided, however, that the requirements for the formation of such districts and commissions with respect to the population and numbers of contiguous counties shall not be applicable to districts and commissions formed pursuant to this subsection. Regional planning and development commissions so formed may function in conjunction with contiguous regional planning and development commissions with respect to any project, plan, program or other activity which by necessity crosses county or state planning and development district boundary lines.