The Electoral Commission has begun organising a by-election in the Ikaroa-Rawhiti electorate.
The seat was formally held by the late Parekura Horomia, but on Wednesday it was declared vacant, following his death last month.
A by-election will be held to elect a Member of Parliament for Ikaroa-Rawhiti on 29 June.
The Electoral Commission says as of 30 April 32,415 people were enrolled to vote in the Maori electorate.
Further enrolments will be accepted until the day before the by-election.
Chief Electoral Officer Robert Peden said the sheer size of Ikaroa-Rawhiti is a challenge.
He said 110 polling places will be placed across the electorate, which stretches along the east coast of the North Island, from Hicks Bay in the Gisborne region to Lake Ferry in Wairarapa.
EasyVote packs will be delivered about a week before the by-election.