About subnational population estimates
Population estimates give the best available measure of the size and age-sex structure of the population usually living in an area. Estimates are based on the latest census data and on births, deaths, and migration since the census.
Subnational population estimates are published annually and national population estimates are published quarterly.
Census usually resident population count: a count of all people who usually live in a given area and are present in New Zealand on a given census night. This count excludes visitors from overseas, visitors from elsewhere in New Zealand, and residents temporarily overseas on census night. The population counts published from the census are not comparable with the estimated resident population.
Estimated resident population: an estimate of all people who usually live in an area at a given date. Visitors from elsewhere in New Zealand or from overseas are excluded.
Internal migration: migration between areas of New Zealand.
International migration: migration into or out of New Zealand. International migration statistics are based on 'permanent and long-term' migration statistics, which are primarily determined by passengers' responses on arrival or departure cards to the questions on where they live and their length of stay or absence.
International migrant arrivals: people from overseas arriving to live in New Zealand for 12 months or more (including permanently), and New Zealanders returning after an absence of 12 months or more. (Referred to as permanent and long-term arrivals in international migration statistics.)
International migrant departures: New Zealanders departing for an absence of 12 months or more (including permanently), and people from overseas departing after a stay of 12 months or more in New Zealand. (Referred to as permanent and long-term departures in international migration statistics.)
Median age: half the population is younger, and half older, than this age.
Natural increase or decrease: natural increase is an excess of births over deaths. Natural decrease is an excess of deaths over births.
Net migration: the difference between the number of people who have moved to, and departed from, a given area. Subnational net migration includes both international migration and internal migration.
North Island and South Island: the population of the North Island is the sum of the population of North Island regions. The population of the South Island is the sum of the population of South Island regions.
Regional council area (or region): an area governed by a regional council. New Zealand currently has 16 regional council areas.
Territorial authority area: an area governed by a territorial authority. New Zealand currently has 67 territorial authority areas (12 cities, 53 districts, Auckland, and the Chatham Islands territory).