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Subnational Population Estimates: At 30 June 2009
Embargoed until 10:45am  –  23 October 2009
Technical notes

Population measures

There are three population measures commonly produced by Statistics New Zealand: census night population count, census usually resident population count, and estimated resident population.

The census night population count of an area in New Zealand is a count of all people present in that area on a given census night. This count includes visitors from elsewhere in New Zealand and visitors from overseas who are counted in that area on census night, but excludes residents of that area who are temporarily elsewhere in New Zealand or overseas on census night.

The census usually resident population count of an area in New Zealand is a count of all people who usually live in that 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 estimated resident population of an area in New Zealand is an estimate of all people who usually live in that area at a given date. This estimate includes all residents of that area present in New Zealand and counted by the census (census usually resident population count), residents who are temporarily overseas (who are not included in the census), and an adjustment for residents missed or counted more than once by the census (net census undercount). Visitors from elsewhere in New Zealand or from overseas are excluded.

The population counts published from the census are not comparable with the estimated resident population.

Base population

The estimated resident population at 30 June 2006 forms the base population for deriving the estimated resident population at a given date following the 2006 Census. The base population is also used in the revision of intercensal population estimates for the five-year period between the 2001 and 2006 Censuses.

The estimated resident population of each area at 30 June 2006 is based on the census usually resident population count from the 2006 Census (held on 7 March 2006), with adjustments for:

  1. net census undercount
  2. residents temporarily overseas on census night
  3. births, deaths, and net migration between census night and 30 June 2006
  4. reconciliation with demographic estimates at ages 0–4 years. 

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Resident population estimates 

Subnational resident population estimates were derived by updating the estimated resident population of each area at 30 June 2006 for births, deaths, net international migration, and net internal migration. Owing to delays between the occurrence of births and deaths and their registration, it is necessary to estimate births and deaths to produce timely resident population estimates. International migration is based on permanent and long-term migration statistics, which are primarily determined by the passenger's response, on the arrival or departure card, to the questions on where they live and their length of stay or absence. Symptomatic data series (eg residential building consents and electoral enrolments) are used to estimate the internal migration component.

Estimated natural increase (excess of births over deaths) and net migration for regional council areas are included in table 4 of this release. Components of population change for territorial authority areas and urban areas are available on request  (email: demography@stats.govt.nz).

Boundaries

Subnational population estimates at 30 June 1996–2000 are based on regional council area, territorial authority area, and urban area boundaries at 30 June 2001. The estimates are based on the revised base population at 30 June 1996 and the base population at 30 June 2001.

Subnational population estimates at 30 June 2001–09 are based on regional council area, territorial authority area, and urban area boundaries at 30 June 2009. The population estimates take into account a boundary change that occurred in December 2008, in which part of the Kaimai area unit was transferred from Western Bay of Plenty district to Tauranga city.

The population of the North Island is the sum of the population of North Island regions, and the population of the South Island is the sum of the population of South Island regions.

Urban areas are defined on the basis of the 1996 census usually resident population count. Main urban areas have a 1996 census usually resident population count of 30,000 or more, whereas secondary urban areas have a 1996 census usually resident population count between 10,000 and 29,999. As a result, Greymouth is still classified as a secondary urban area, even though the 2006 census usually resident population count and the estimated resident populations at 30 June 2001–09 fall below the 10,000 population mark.

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Rounding

All figures in this release have been rounded independently. Population estimates for areas with less than 10,000 are rounded to the nearest 10. Populations between 10,000 and 20,000 are rounded to the nearest 50. Populations of 20,000 or more are rounded to the nearest 100. Population changes are rounded to the nearest 10.

All derived figures in this release have been calculated using data of greater precision than published.

Final figures

The estimates in this release are provisional. They incorporate provisional estimates of the number of births and deaths that occurred in the June 2009 year. Final estimates for regional council areas, territorial authority areas, and main and secondary urban areas will be available on the Statistics NZ website (www.stats.govt.nz) by 30 November 2009. In addition, population estimates after 30 June 2006 will be revised following results from the 2011 Census of Population and Dwellings.

Availability of other subnational population estimates

Final estimates, by five-year age group and sex, for regional council areas, territorial authority areas, and area units, will be made freely available on the Statistics NZ website (via Table Builder) on 18 December 2009.

Final estimates for wards, community boards, subdivisions, constituencies, and district health boards (at the total population level) will be available on the Statistics NZ website by 29 January 2010.

Estimates for other subnational areas (eg minor urban areas) will be available on request from January 2010 (email: demography@stats.govt.nz).

Subnational population estimates at 30 June 1996–2009 are available on the Statistics NZ website. The population series is also available on our online database Infoshare (demography population estimates in the Population category).

More information

For more information, refer to information about the population estimates on the Statistics NZ website.

Quarterly national population estimates by single-year of age, five-year age groups, and selected age groups are available via Infoshare on the Statistics NZ website (demography age estimates in the Population category).

National population estimates for the Māori ethnic group are updated twice a year on the Statistics NZ website.

Copyright

Information obtained from Statistics NZ may be freely used, reproduced, or quoted unless otherwise specified. In all cases Statistics NZ must be acknowledged as the source.

Liability

While care has been used in processing, analysing and extracting information, Statistics NZ gives no warranty that the information supplied is free from error. Statistics NZ shall not be liable for any loss suffered through the use, directly or indirectly, of any information, product or service.

Timing

Timed statistical releases are delivered using postal and electronic services provided by third parties. Delivery of these releases may be delayed by circumstances outside the control of Statistics NZ. Statistics NZ accepts no responsibility for any such delays.

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