National's Dan Bidois is holding a 1,190 vote lead ahead of closest candidate Labour's Shanan Halbert in the Northcote by-election, according to the preliminary count.
Mr Bidois currently has 8,965 votes and Mr Halbert has 7,775 votes.
90.9% per cent per cent of the votes have been counted.
Eight candidates are contesting the seat that had been held by former National MP Jonathan Coleman.
The Auckland electorate saw a massive turnout prior to election day, with 11,464 people voting before today.
Green Party's Rebekah Jaung is sitting at third, with ACT's Stephen Berry at fourth place.
The by-election will determine who will replace former National MP Jonathan Coleman, who left Parliament earlier this year.
They will be New Zealand's newest MP.
Results are expected to be announced by 10pm today. The official result, which includes special and overseas votes, are expected to be released on June 20.
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