1. Except as otherwise provided in subsection 2 of this section, the county planning board shall consist of one of the commissioners of the county commission selected by the county commission, the county highway engineer, both of whom shall serve during their tenure of office, except that in any county of the first classification with more than eighty-two thousand but fewer than eighty-two thousand one hundred inhabitants such members shall be nonvoting members, and six residents of the unincorporated territory of the county who shall be appointed by the county commission. The term of the six appointed members shall be four years or until their successor takes office, except that the original term of three of the six appointed members shall be two years. Members may be removed for cause by the county commission upon written charges after public hearings. Any vacancy may be filled by the county commission for the unexpired term of any member whose term becomes vacant, or until the member’s successor takes office. All members of the board shall serve without compensation; except, that an attendance fee as reimbursement for expenses may be paid to the appointed members of the board in an amount, set by the county commission, not to exceed twenty-five dollars per meeting. The planning board shall elect its chairman from among the appointed members.

2. In any county of the first classification with a population of at least two hundred thousand inhabitants which does not adjoin any other county of the first classification, the county planning board may, at the option of the county commission, consist of one of the commissioners of the county commission selected by the county commission, and shall include the county highway engineer and six residents of the unincorporated territory of the county, who shall be appointed by the county commission. The county highway engineer and the county commissioner, if a member of the board, shall serve during such person‘s tenure of office. The term of the six appointed members shall be three years or until their successor takes office.