Precisely's postcode boundaries are generated by combining the postcode and locality information from the Australia Post postcode listing, with the locality information from Precisely’s Suburbs and Localities product. The locality information in the Suburbs and Localities product contains both gazetted suburbs and non-gazetted Localities, and is based on source from Geoscape Australia's Localities data.
The illustration below shows how the boundary of postcode 4051 is formed by the suburb boundaries listed.
Note: In areas where no gazetted suburbs exist, the locality boundaries are used to facilitate full, nationwide postcode coverage.
Some of the postcodes listed in the Australia Post listing are not included in the Postcodes Australia product. Although there are exceptions, the types of postcodes that are not generally included are:
- PO Boxes that do not relate to a Delivery Area
- Large Volume Receivers (LVR) and Special Mailings (for example, Competition Mail)
- Postcodes that relate to the Antarctic Division stations