Maori, Asian, and Pacific populations will rise in nearly all regions and territorial authorities, but those identifying as "European or Other" will represent a lesser share of people.
The Maori population will make up nearly 20 per cent of the total population by 2038, up from nearly 16 per cent in 2013.
Meanwhile, the Asian population will increase from 12 per cent in 2013 to 21 per cent in 2038.
The Pacific population will also increase, from 8 per cent in 2013 to 11 per cent in 2038.
African, Middle Eastern and Latin American populations are also expected to grow nationally but the numbers are too small for Statistics New Zealand to project percentage growth.
The "European or Other" population will drop from 75 per cent in 2013 to 66 per cent in 2038.
All four ethnic populations will age, with increasing numbers and proportions of their populations at the older ages.