Must be used with other items to distinguish between categories such as "overseas" and "at sea". Do not rely on the postcode as there are some Queensland postcodes for patients who live over the border in other States such as New South Wales.

The Statistical Services Branch (SSB) maintains a corporately standardised file of suburbs, postcodes, states and associated Statistical Local Areas. The content of this locality data set is derived from two main sources, the ABS and Australia Post, with supplementary data supplied by Queensland Health.

The Australian Bureau of Statistics provides annual releases on 1 July each year of the NLI, Street Sub-Index and ASGC data. Quarterly updates are now also received and loaded into CRDS. Australia Post data is downloaded from their website at the same time as the ABS updates are received for synchronisation of data. Ad hoc additions are made to the locality data set as advised by the source organisations.

The most up-to-date locality file and associated documentation are available from the Corporate Reference Data System (CRDS). The CRDS file can be browsed in QHEPS via <INTERNAL QH LINK NOT AVAILABLE> or an extract can be requested via email crds@health.qld.gov.au.