Mich. Comp. Laws § 125.13: Regional planning commissions; limit of jurisdiction.

Sec. 3.

The boundaries of the area which are to define the limit of jurisdiction of the regional planning commission shall be established by the resolutions of the participating legislative bodies. The boundaries of this area need not be coincident with the boundaries of any single governmental subdivision or group of subdivisions which are to be included in the area, but may include all or such portions of any governmental subdivision.