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 Castletown, accounting for 27.5%.

Section overview

Household income quartiles

Castletown - Households (Enumerated)

This table summarises household income quartiles for Castletown in 2021 for persons, with comparison against Esperance (S) and change since 2016.

Household income quartiles snapshot

2021 distribution by category for Castletown, with comparison markers for Esperance (S).

Castletown
Esperance (S)

Lowest group

2021 count

353

% of total

27.5%

Change from 2016

-

Medium lowest

2021 count

351

% of total

27.3%

Change from 2016

-

Medium highest

2021 count

336

% of total

26.2%

Change from 2016

-

Highest group

2021 count

244

% of total

19.0%

Change from 2016

-

Data table

Household income quartiles for Castletown. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Esperance (S).

Household income quartiles for Castletown. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Esperance (S).
Household income quartiles for Castletown. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Esperance (S).
Category20212016Change
Count%Esperance (S)%Count%Esperance (S)%Countpp
Lowest group35327.5%29.8%32526.7%29.6%--
Medium lowest35127.3%26.8%33827.8%27.9%--
Medium highest33626.2%25.1%30224.9%23.8%--
Highest group24419.0%18.3%25020.6%18.6%--
Total Households1,284100.0%100.0%1,215100.0%100.0%--