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 lowest household income quartile held the largest share among households with income in Girrawheen, accounting for 35.7%.

Section overview

Household income quartiles

Girrawheen - Households (Enumerated)

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

Household income quartiles snapshot

2021 distribution by category for Girrawheen, with comparison markers for Wanneroo (C).

Girrawheen
Wanneroo (C)

Lowest group

2021 count

1,061

% of total

35.7%

Change from 2016

-

Medium lowest

2021 count

994

% of total

33.4%

Change from 2016

-

Medium highest

2021 count

665

% of total

22.4%

Change from 2016

-

Highest group

2021 count

255

% of total

8.6%

Change from 2016

-

Data table

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

Household income quartiles for Girrawheen. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Wanneroo (C).
Household income quartiles for Girrawheen. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Wanneroo (C).
Category20212016Change
Count%Wanneroo (C)%Count%Wanneroo (C)%Countpp
Lowest group1,06135.7%21.7%95335.0%21.1%--
Medium lowest99433.4%25.9%94334.7%25.9%--
Medium highest66522.4%29.0%58121.4%29.2%--
Highest group2558.6%23.3%2438.9%23.8%--
Total Households2,975100.0%100.0%2,720100.0%100.0%--