(a) Three members from the local planning commission of each city in the county whose population is 40,000 or more, appointed by the respective governing bodies of those cities;

(b) One member from the local planning commission of each city in the county whose population is less than 40,000, appointed by the respective governing bodies of those cities; and

(c) Three members from the local planning commission of the county, appointed by the governing body of the county, at least two of whom must reside in unincorporated areas of the county.

2. Except for the terms of the initial members of the commission, the term of each member is 3 years and until the selection and qualification of his successor. A member may be reappointed. A member who ceases to be a member of the local planning commission of the jurisdiction from which he is appointed automatically ceases to be a member of the commission. A vacancy must be filled for the unexpired term by the governing body which made the original appointment.

3. The commission shall elect its chairman from among its members. The term of the chairman is 1 year. The member elected chairman must have been appointed by the governing body of the county or a city whose population is 40,000 or more, as determined pursuant to a schedule adopted by the commission and made a part of its bylaws which provides for the annual rotation of the chairmanship among each of those governing bodies.