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 Middlemount, accounting for 49.2%.

Section overview

Household income quartiles

Middlemount - Households (Enumerated)

This table summarises household income quartiles for Middlemount in 2021 for persons, with comparison against Isaac (R) and change since 2016.

Household income quartiles snapshot

2021 distribution by category for Middlemount, with comparison markers for Isaac (R).

Middlemount
Isaac (R)

Lowest group

2021 count

28

% of total

7.1%

Change from 2016

-

Medium lowest

2021 count

47

% of total

11.9%

Change from 2016

-

Medium highest

2021 count

126

% of total

31.8%

Change from 2016

-

Highest group

2021 count

195

% of total

49.2%

Change from 2016

-

Data table

Household income quartiles for Middlemount. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Isaac (R).

Household income quartiles for Middlemount. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Isaac (R).
Household income quartiles for Middlemount. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Isaac (R).
Category20212016Change
Count%Isaac (R)%Count%Isaac (R)%Countpp
Lowest group287.1%13.5%163.6%14.5%--
Medium lowest4711.9%16.3%419.3%15.4%--
Medium highest12631.8%27.3%15234.5%28.1%--
Highest group19549.2%42.9%23152.5%42.0%--
Total Households396100.0%100.0%440100.0%100.0%--