MidCentral District Health Board is the latest DHB to fully vaccinate 90 percent of its eligible population.
The DHB in the central North Island includes Palmerston North, Horowhenua and Manawatū.
More than 288,000 doses of the Pfizer and 75 doses of the AstraZeneca vaccines have been administered in the rohe.
The DHB's Covid-19 response manager, Bronwen Warren, said it was a significant achievement for its 80 vaccinators, and 25 administration and logistics staff.
"There are not many places in the world that have achieved this level of vaccination, and we are thankful for every person who has had a conversation with a friend, colleague or family member and rolled up their sleeves to get vaccinated."
But there was still work ahead for 2022, with hopes to surpass the 90 percent milestone, Warren said.
"With 90 percent of our eligible Māori population reaching the first dose milestone last week, and second doses for Māori not far behind, we are confident we will reach this milestone soon."
Warren also acknowledged the mahi from nurses, iwi and Māori health providers, doctors and community pharmacists who have been integral to the rollout.
Last week, the Ministry of Health said 8 million doses of the vaccine had been administered across the country, with 90 percent of the country's whole eligible population fully vaccinated too.