In a vote on June 9, 97 per cent of members were in favour of the change.
Leading the change is the new Senior Minister, Rev Howard Carter, who was inducted three weeks ago.
Rev Carter comes to Whangarei with his wife Kris, a high school maths teacher, and youngest son Isaac, with much experience to share.
The vision, inspired by other Presbyterian churches in other New Zealand centres, is to come together to share the increased cost of ordained ministry, and to cut out duplication of all the work that goes into being church.
''By coming together our people will find they have more energy," he said.
"The desire of HopeWhangarei, is to build a flourishing intergenerational fellowships across the three sites, that will seek God's best for the city and beyond."
Rev Carter said he is excited to be working with Rev Lorne Campbell and a team of elders, staff and leaders to initiate these changes that will bring hope to people in the community.
HopeWhangarei will be launched at a special service at 10am on June 30 at the Northland Event Centre.
The moderator of the Presbyterian Church of Aotearoa New Zealand, the Right Reverend Fakaofo Kaio, will be speaking and constituting the new entity, and there will be other guests including former ministers and Whangarei Mayor, Sheryl Mai.