How postcodes work

Postcodes are four digits and each digit has a specific meaning.

The first digit of the postcode represents one of ten machine 'lines' (numbered 0 - 9), which process mail for a specific geographic region. These run north to south in ascending order.

The second and third digits reflect postal sort areas and our New Zealand Post delivery network - urban posties, New Zealand Post PO Boxes, Private Bags and RuralPost.

The fourth digit identifies the specific box lobby, rural delivery round or urban area.

How to use postcodes

A postcode should be used on all addresses. If the postcode contains a leading zero, this zero must be included. The postcode must not include separators or spaces.

There are only one or two spaces between town/city and postcode, for example:

  • Auckland 1112
  • Christchurch 8110

For more details download the Quick guide to addressing your letters and parcels (PDF - 154KB)

Stay up to date

New suburban developments and changes in postal delivery mean that postcode information changes regularly. For the most up to date information check our Address & Postcode Finder.