Statistical Area Level 2 (SA2)
A medium-sized area defined by the ABS to represent a community that interacts socially and economically. Most have between 3,000 and 25,000 residents.
What an SA2 is
Statistical Area Level 2s are areas the ABS designs for publishing statistics. The ABS defines each one to represent a community that interacts together socially and economically. Most have between 3,000 and 25,000 residents, and around 10,000 is typical.
There are 2,571 SA2s in the 2026 boundaries, up from 2,473 in 2021, covering the whole country. Each is built from whole SA1s, and SA2s fit exactly inside SA3s and SA4s, so figures add up cleanly from one level to the next.
SA2s and suburbs
SA2s often share a name with a suburb, but they're not the same thing. Small suburbs are grouped into one SA2 and large ones are split, which is where names like Brunswick - North come from. In fast-growing areas the ABS splits SA2s as the population rises: for 2021, Riverstone - Marsden Park in Sydney's north-west became seven SA2s.
If you need the area people actually call a suburb, use the ABS suburb boundaries (SAL). If you need the most data and boundaries that stay comparable over time, use SA2s.
Why analysts use SA2s
- More data than other small areas. Beyond the Census, the ABS publishes annual population estimates and a range of other statistics by SA2.
- Built for comparison. SA2s are designed to be similar in population, so comparing one with another is fairer than comparing suburbs or councils of very different sizes.
- Stable over time. The ABS changes as few SA2 boundaries as it can between editions, which makes trends easier to follow.
Codes and editions
Every SA2 has a nine-digit code that carries its place in the hierarchy: one digit for the state, two for the SA4, two for the SA3 and four for the SA2 itself. Codes and some boundaries change between editions, so a code from 2021 data may not match one from 2026.
The ABS began releasing the 2026 boundaries in July 2026, and the 2026 Census will be published on them. Most of the changes from 2021 are splits in fast-growing areas on the edges of cities.
SA2s in Censible
Censible uses the 2026 SA2 boundaries. SA2s sit under statistical areas, labelled by name and state with a small SA2 tag, and you can find them by name or code.
Source: ABS, Australian Statistical Geography Standard (ASGS) Edition 4, Statistical Area Level 2.
Suburbs and Localities (SAL)
The ABS's approximation of officially recognised suburbs and localities, built from mesh blocks. It replaced State Suburbs (SSC) from the 2021 Census.
Local Government Area (LGA)
LGA stands for Local Government Area: the area a local council looks after. In ABS data, LGAs are the ABS's version of council boundaries, built from small mesh blocks so Census figures can be published for every council in Australia.
Socio-Economic Indexes for Areas (SEIFA)
SEIFA is a set of four ABS indexes that rank areas of Australia by relative socio-economic advantage and disadvantage, using Census data. Each area gets a score, a rank and a decile, where decile 1 is the lowest-scoring 10% of areas and decile 10 the highest.
Statistical Area Level 1 (SA1)
The smallest area the ABS uses to publish most Census data. An SA1 is a neighbourhood block of about 400 people, usually between 200 and 800, and SA1s fit together to form SA2s.
Statistical Area Level 3 (SA3)
A regional area made up of neighbouring SA2s with similar characteristics, usually home to between 30,000 and 130,000 people. SA3s are used for regional statistics and fit together to form SA4s.
Australian Statistical Geography Standard (ASGS)
The ABS's framework of boundaries for publishing statistics, from mesh blocks of a few dozen dwellings up to states and territories, plus the ABS's versions of councils, suburbs and postcodes. It's redrawn every five years; Edition 4, released from July 2026, is the one the 2026 Census will use.
Questions people ask
There are 2,571 in the 2026 boundaries, which the 2026 Census will use, up from 2,473 in 2021. Most of the new ones come from splitting SA2s in fast-growing areas.
Not always. Some SA2s match a suburb, but many group several small suburbs together or split a large suburb in two. The ABS suburb boundaries (SAL) are the ones that follow suburb names.
Most have between 3,000 and 25,000 residents, with around 10,000 typical. In remote areas an SA2 can cover a very large area of land to reach that population.
Yes, approximately. The ABS publishes correspondence files that show how much of each postcode's population falls in each SA2. The result is an estimate, because postcodes and SA2s don't share boundaries.