(1) In a city which adopts the commission plan of government pursuant to sections 19-401 to 19-433, the number of city council members shall be determined by the class and population of the city. In cities having two thousand or more but not more than forty thousand inhabitants, there shall be five members, in cities of the primary class, there shall be five members, and in cities of the metropolitan class, there shall be seven members. Council members shall be elected from the city at large. In cities of the primary class, three excise members shall be elected in addition to the five council members. Nomination and election of all council members shall be by nonpartisan ballot. The mayor shall be elected for a four-year term.
(2) In cities containing two thousand or more but not more than forty thousand inhabitants, at the city council election in 1980, the council member elected as the commissioner of the department of public works and the council member elected as the commissioner of the department of parks and recreation shall each serve a term of four years. If a city elects to adopt the commission plan of government after 1980, the council member elected as the commissioner of the department of public works and the council member elected as the commissioner of the department of public accounts and finances shall each serve a term of four years and the council member elected as the commissioner of the department of streets, public improvements, and public property and the council member elected as the commissioner of the department of parks and recreation shall each serve a term of two years. Upon the expiration of such terms, all council members shall serve terms of four years and until their successors are elected and qualified.