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: St Marys (SA)
SAL
: Mitcham (C)
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Income

Household income quartiles

About this topic

Household income quartiles group households into four evenly sized income ranges so relative income position can be compared across places and across Census years. They provide a distribution view of household income rather than a simple count in fixed dollar brackets.

This topic is useful because raw household income amounts are influenced by inflation and broader economic shifts. Quartiles make it easier to see whether an area's households are concentrated toward lower, middle, or higher income positions over time.

Interpretation notes

  • This is a derived distribution of total household income, so each quartile shows relative position rather than a fixed income bracket.
  • It is useful for over-time comparison because quartile groupings are less distorted by inflation than raw dollar bands.

Key insight

In 2021, the medium-high household income quartile held the largest share among households with income in St Marys (SA), accounting for 28.2%.

Section overview

Household income quartiles

St Marys (SA) - Households (Enumerated)

This table summarises household income quartiles for St Marys (SA) in 2021 for persons, with comparison against Mitcham (C) and change since 2016.

Household income quartiles snapshot

2021 distribution by category for St Marys (SA), with comparison markers for Mitcham (C).

St Marys (SA)
Mitcham (C)

Lowest group

Medium lowest

Medium highest

Highest group

Data table

Household income quartiles for St Marys (SA). Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Mitcham (C).

Household income quartiles for St Marys (SA). Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Mitcham (C).
Household income quartiles for St Marys (SA). Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Mitcham (C).
Category20212016Change
Count%Mitcham (C)%Count%Mitcham (C)%Countpp
Lowest group28324.3%17.8%27827.7%18.5%--
Medium lowest28224.2%20.1%24724.7%19.6%--
Medium highest32828.2%22.7%25625.5%23.8%--
Highest group27023.2%39.4%22122.1%38.0%--
Total Households1,163100.0%100.0%1,002100.0%100.0%--