The Bay of Plenty population will continue to grow over the next 30 years, according to Statistics New Zealand.
The Government agency has revised the growth predictions up recently as more migrants than expected head for our shores.
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The regional population is set to rise by an average of 0.8 per cent annually until 2043, according to the predictions, but growth was expected to slow after 2018.
Statistics New Zealand has released the updated population projections showing more growth for many regions, following an increase in immigration.
"New Zealand has recently been experiencing record high levels of net migration," spokesman Peter Dolan said.
"Our projections have been updated to reflect that."
The number of immigrants coming to New Zealand in 2016 exceeded 71,000.
This means the projected population increase is now much higher, especially for the Bay of Plenty.
The last projected figures, released in 2015, predicted 0.5 per cent growth for the Bay.
The population increase was now expected in all parts of the region over the next 30 years, with the largest projected growth in Tauranga.
The city would experience 1.4 per cent population growth annually, just behind Auckland on 1.5 per cent.
The Western Bay of Plenty's population is expected to grow by 0.8 per cent, Whakatane by 0.1 and Rotorua by 0.2 per cent.
This was a significant change from the 2015 projections, which predicted a population decrease for both Whakatane and Rotorua.
The recent adjustments were based on a lower fertility rate in most areas of the country as well as higher migration.
An ageing population was largely responsible for the projected slowdown in population growth, Mr Dolan said.
"Due to our population's changing age structure, which is a result of fewer births and more deaths, population growth will slow in the long term."
But the Bay of Plenty population was younger than average, with Tauranga city expected to gain more children in the coming decades.
The Bay of Plenty's projected population growth was the fourth highest in the country, behind Auckland, Canterbury and Waikato.