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 highest household income quartile held the largest share among households with income in Willunga, accounting for 30.8%.

Section overview

Household income quartiles

Willunga - Households (Enumerated)

This table summarises household income quartiles for Willunga in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.

Household income quartiles snapshot

2021 distribution by category for Willunga, with comparison markers for Onkaparinga (C).

Willunga
Onkaparinga (C)

Lowest group

2021 count

174

% of total

20.4%

Change from 2016

-

Medium lowest

2021 count

211

% of total

24.7%

Change from 2016

-

Medium highest

2021 count

206

% of total

24.1%

Change from 2016

-

Highest group

2021 count

263

% of total

30.8%

Change from 2016

-

Data table

Household income quartiles for Willunga. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).

Household income quartiles for Willunga. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
Household income quartiles for Willunga. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
Category20212016Change
Count%Onkaparinga (C)%Count%Onkaparinga (C)%Countpp
Lowest group17420.4%24.5%15320.2%23.5%--
Medium lowest21124.7%27.0%18824.8%27.0%--
Medium highest20624.1%26.4%19826.1%27.1%--
Highest group26330.8%22.1%22029.0%22.4%--
Total Households854100.0%100.0%759100.0%100.0%--