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 O'Sullivan Beach, accounting for 33.2%.

Section overview

Household income quartiles

O'Sullivan Beach - Households (Enumerated)

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

Household income quartiles snapshot

2021 distribution by category for O'Sullivan Beach, with comparison markers for Onkaparinga (C).

O'Sullivan Beach
Onkaparinga (C)

Lowest group

2021 count

249

% of total

33.2%

Change from 2016

-

Medium lowest

2021 count

244

% of total

32.5%

Change from 2016

-

Medium highest

2021 count

161

% of total

21.5%

Change from 2016

-

Highest group

2021 count

96

% of total

12.8%

Change from 2016

-

Data table

Household income quartiles for O'Sullivan Beach. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).

Household income quartiles for O'Sullivan Beach. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
Household income quartiles for O'Sullivan Beach. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
Category20212016Change
Count%Onkaparinga (C)%Count%Onkaparinga (C)%Countpp
Lowest group24933.2%24.5%23633.4%23.5%--
Medium lowest24432.5%27.0%22832.3%27.0%--
Medium highest16121.5%26.4%15822.4%27.1%--
Highest group9612.8%22.1%8411.9%22.4%--
Total Households750100.0%100.0%706100.0%100.0%--