80 (2) General elections to local authorities must take place concurrently with presidential and parliamentary general elections. (3) Polling in by-elections to Parliament and local authorities must take place within ninety days after the vacancies occurred unless the vacancies occur within nine months before a general election is due to be held, in which event the vacancies may remain unfilled until the general election. 7.5 Filling of electoral vacancies Whenever a vacancy occurs in any elective public office established in terms of this Constitution, other than an office specified in section 7.4, the authority charged with organising elections to that body must cause an election to be held within ninety days to fill the vacancy. PART 3 DELIMITATION OF ELECTORAL BOUNDARIES 7.6 Number of constituencies and wards (1) For the purpose of electing members of Parliament, the Zimbabwe Electoral Commission must divide Zimbabwe into two hundred and ten constituencies. (2) For the purpose of elections to local authorities, the Zimbabwe Electoral Commission must divide local authority areas into wards according to the number of members to be elected to the local authorities concerned. 7.7 Delimitation of electoral boundaries (1) Once every ten years, on a date or within a period fixed by the Commission so as to fall as soon as possible after a population census, the Zimbabwe Electoral Commission must conduct a delimitation of the electoral boundaries into which Zimbabwe is to be divided. (2) If a delimitation of electoral boundaries is completed less than six months before polling day in a general election, the boundaries so delimited do not apply to that election, and instead the boundaries that existed immediately before the delimitation are applicable. (3) The boundaries of constituencies must be such that, so far as possible, at the time of delimitation equal numbers of voters are registered in each constituency within Zimbabwe. (4) The boundaries of wards must be such that, so far as possible, at the time of delimitation equal numbers of voters are registered in each ward of the local authority concerned. (5) In delimiting (a) the boundaries of wards, the Zimbabwe Electoral Commission must ensure that no ward is divided between two or more local authority areas; (b) the boundaries of constituencies, the Zimbabwe Electoral Commission must ensure that no ward is divided between two or more constituencies. (6) In dividing Zimbabwe into wards and constituencies, the Zimbabwe Electoral Commission must, in respect of any area, give due consideration to (a) its physical features;