A charter county is organized under Public 293 of 1966 (amended in 1980), the Charter Counties Act, in which a county electorate can organize limited home rule under a county charter. Upon the proposal for the organization of a charter county, voters are given a choice between a government headed by a county executive elected on a partisan basis, or a chief administrative officer selected by the board of commissioners for a four-year term who may only be removed by a 2/3 majority of the board. The board of commissioners in a charter county may have up to 21 members for counties with populations less than 600,000, but must have between 13 and 27 members for counties with population greater than 600,000. While more flexible than the optional unified type of government, the elected county executive in a charter county must still share executive power with the other statutorily created officers of the county government.