Every electorate has roughly the same number of people in it.
Over time, some areas can grow while others shrink, and the boundary lines need adjusting. Every five years, after the population census, the Representation Commission looks at all of the electorates. This process starts with the Maori Electoral Option . If there has been a large population shift in an electorate, the Commission may have to change the boundaries to ensure each electorate has approximately the same number of people in it. Detailed maps of all the electorates are online now.