72.407.  Adoption of boundary change by voters, procedure — unincorporated pocket defined — cost of election, how paid — proposal concerning annexation and incorporation not to be submitted at same election, election void, when. — 1.  Boundary changes may be adopted by the voters in the following manner:

  (1)  If the commission approves a proposed boundary change containing more than one municipality and no unincorporated areas, such proposal shall be adopted if a separate majority of the votes cast on the question in each municipality are in favor of the boundary change, except as provided in subsection 4 of section 72.405;

  (2)  If the commission approves a proposed boundary change containing one or more municipalities and at least one unincorporated area, such proposal shall be adopted if a separate majority of the votes cast on the question in each municipality and a separate majority of votes cast in each voting jurisdiction comprising unincorporated areas of the county are in favor of the boundary change, except as provided in subsection 4 of section 72.405.  If a voting jurisdiction comprising unincorporated areas of the county has no residents or if no votes are cast for or against the boundary change, such boundary change shall become effective if a majority of the votes cast in all other voting jurisdictions and municipalities are in favor of the boundary change.  If the commission approves a proposed boundary change containing one or more municipalities and at least one unincorporated area which is classified as an unincorporated pocket, such proposal shall be adopted if a separate majority of the votes cast on the question in each municipality and a majority of votes cast in the whole municipality which would result from the boundary change are in favor of the boundary change, except as provided in subsection 4 of section 72.405.  As used in this subdivision, the term "unincorporated pocket" means an unincorporated territory with an average residential density in excess of one dwelling per three acres, which has a population of no more than five hundred, which is accessible by public or private roadway only from incorporated jurisdictions and/or another county, and which the commission has determined presents practical difficulties for service by the county by reason of its isolation.

  2.  Any election held pursuant to sections 72.400 to 72.423 shall be held on a date established by the commission in accordance with the provisions of chapter 115.  If the proposing agent is a petitioner or the governing body of the county, all costs of the election shall be paid by the county.  If the proposing agent is the governing body of any municipality, the cost of such election in each municipality shall be paid by each municipality and if the proposal contains any unincorporated territory the cost of the election in the unincorporated territory shall be paid by the county.

  3.  Questions concerning the annexation of an area covered by sections 72.400 to 72.423 and the incorporation of the same area shall not be put to the voters at the same election.  Any such election where the questions of annexation and incorporation have been put to the voters shall be void in the area covered by both propositions.  This subsection shall not affect the results of that election in areas where both questions were not put to the voters at the same time.  When boundary change proposals for annexation and for incorporation cover the same area, the proposal for annexation shall be put to the voters first.