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STATISTICAL AREA LEVEL 1 (SA1)
Rural SA1s contain one or more of the following:
For the 2011 Edition of the ASGS, SA1s closely reflect LGA boundaries.
SA1s are generally internally connected by road transport. Exceptions include islands, which are either combined with the nearest onshore SA1 or grouped to form an SA1.
Gazetted Suburbs and Localities
Where possible, the SA1s have been designed to contain or aggregate to whole gazetted suburbs or rural localities. In urban areas, the gazetted suburbs usually consist of one or more SA1s.
In regional and remote areas, gazetted localities were sometimes too small to represent an SA1 in their own right. Where this occurred, four general criteria were used to cluster smaller localities:
SA1s have been created in anticipation of development likely to occur up to the time of the 2011 Census of Population and Housing (August 2011).
Prisons, remand centres and juvenile detention centres with a population of over 200 persons are generally represented by their own SA1.
Defence bases with a population of over 200 persons are generally represented by their own SA1.
Zero SA1s are SA1s with a nil or nominal population. They are created to represent large unpopulated areas that are not easily combined with surrounding populated SA1s.
They may include one or more of:
Special Purpose SA1
There are non-spatial SA1s for Migratory, Offshore, Shipping and No Usual Address in each S/T.
SA1 CODING STRUCTURE
SA1s are not named. They are identified either by an 11-digit fully hierarchical code, or by a truncated 7-digit code comprising the S/T, SA2 and SA1 identifiers. The SA1 identifier is a 2-digit code, assigned within an SA2. An SA1 code is only unique within an S/T when it is preceded by the S/T identifier.
An 11-digit SA1 code is fully hierarchical, and comprises: S/T identifier, SA4 identifier, SA3 identifier, SA2 identifier and a SA1 identifier.
A 7-digit SA1 code is not fully hierarchical and comprises: S/T identifier, SA2 identifier and SA1 identifier.
Future Allocation of SA1 Codes
In the future, it may be necessary to allocate new codes. If an SA1 is abolished, or changes significantly between editions of the ASGS, the SA1 identifier will be retired and the replacement SA1(s) given the next available previously unused SA1 identifier within the SA2.
SA1 Identifier Ranges
Within each SA2, the SA1 identifier is in the data range 01 to 99.