Assignment of postcodes

Postcodes are allocated to geographic areas to help us process and deliver mail to our customers. The current 4-digit numeric postcode system was introduced in 1967 with the first mechanised mail processing centre in Australia.

Naming localities and defining boundaries Click to expand Click to collapse

The relevant State and Local Government Authorities in each state are responsible for locality naming and determining boundary extent.

Contact your local council or shire if you have any concerns about your assigned locality.

How we decide whether to use new or existing postcodes Click to expand Click to collapse

Our decision as to whether a new or an existing postcode is to be allocated to a locality is based on operational efficiency. Factors including the configuration of our network, transportation connections and delivery arrangements are all taken into consideration when making our decision.

Changing an existing postcode Click to expand Click to collapse

Australia Post may introduce, retire or change postcodes at any time at its absolute discretion to support operational requirements and provide enhanced service to our customers.

Changes to postcodes may involve consultation with the local council/shire and residents, depending upon the scale and significant impact of the change.

Postcode changes are implemented from a specified date but we ensure that either postcode can be recognised for a limited period without reducing service to customers.

Postcode Booklet Click to expand Click to collapse

Our Postcode Booklet lists over 10,000 place names. If a particular place name can't be found in the Booklet, a full list of localities and their postcodes is available via our postcode finder.

Can other organisations use postcodes? Click to expand Click to collapse

Postcodes remain at all times the property of Australia Post and shall not be reproduced without Australia Post's permission.

Australia Post grants limited, revocable, non-exclusive licence to download and use Postcodes for the sole purpose of non-commercial reference.

Other than the use expressly permitted above, other organisations are expressly forbidden to download, copy or use all or any Postcodes for any of the following purposes:

  • use in any database and/or application for the purposes of providing, updating or maintaining any publicly available postcode look up or finder functionality;
  • to sub-license, sell, lend, rent, transfer, lease or grant any rights or use in any form or by any means all or any portion of the extract file(s) and the data contained within or make the extract file(s) and the data contained within available to any person, company, organisation, agency, or business entity without prior written permission of Australia Post;
  • to modify the extract file;
  • to reverse engineer or disassemble the extract file;
  • to create derivative works based on the extract file;
  • to remove or obscure any notice of copyright, trademark or other proprietary rights;
  • to make any use of the extract file in a way which directly or indirectly causes Australia Post financial loss (including, without limitation, consequential damages with existing clients and / or loss of commercial opportunities with existing clients and / or potential future clients).

Need more information?

If you have any questions about how we allocate postcode, call our postcode enquiry service on 13 13 18.

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