A living wage and an early harbour crossing are the latest promises being put on the table by Auckland mayoral candidates.

Vic Crone launched her campaign last night, with a pledge to make $150 million of council money available to fast-track the Government-backed second harbour crossing.

Crone said Auckland's population north of the bridge was forecast to grow by 130,000 by 2033 and a second harbour crossing was an "absolute key priority for me as mayor".

"Auckland has a history of delaying large infrastructure projects. Opportunities lost today mean we pay for them tomorrow.

"If elected mayor, I will immediately make available up to $150 million as an initial contribution to the Government-backed project to ensure we get a construction date early in the next decade," Crone told supporters at her campaign launch last night.

Phil Goff has responded this morning, with a promise to introduce a living wage for all Auckland Council staff instead of salary increases for high-paid staff.

Meanwhile, Auckland Council has launched a $1.22 million campaign to reverse the city's falling voter turnout, particularly with migrants and younger age groups.

Porirua will be the most hotly contested election this year with 4.6 candidates per seat, followed by Tauranga, Hamilton, Rotorua, Auckland and Queenstown.