Wairarapa has nearly 500 potential voters who have apparently departed the electorate, according to Registrar of Electors Philip Parkes.
His office has received 494 enrolment packs with "gone, no address", which means those people are not eligible to vote for Wairarapa in this year's general election.
Nationally, more than 43,000 voters have moved house without updating their enrolment details, said Murray Wicks, National Manager of Enrolment Services.
As of July 31, enrolment for Wairarapa stands at 97.37 per cent. That means an estimated 1300 non-enrolled voters.
"If you're not sure whether you're enrolled, now's the time to check."