All of the members of the planning commission shall be residents of the municipality. On all planning commissions appointed pursuant to this act, a certain number of the members, designated as citizen members shall not be officers or employees of the municipality. On a commission of three members at least two shall be citizen members. On a commission of four or five members at least three shall be citizen members. On a commission of either six or seven members at least five shall be citizen members, and on commissions of either eight or nine members at least six shall be citizen members.
53 P.S. § 10205