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 medium-low household income quartile held the largest share among households with income in St Johns Park, accounting for 28.4%.

Section overview

Household income quartiles

St Johns Park - Households (Enumerated)

This table summarises household income quartiles for St Johns Park in 2021 for persons, with comparison against Fairfield (C) and change since 2016.

Household income quartiles snapshot

2021 distribution by category for St Johns Park, with comparison markers for Fairfield (C).

St Johns Park
Fairfield (C)

Lowest group

2021 count

468

% of total

27.8%

Change from 2016

-

Medium lowest

2021 count

478

% of total

28.4%

Change from 2016

-

Medium highest

2021 count

401

% of total

23.8%

Change from 2016

-

Highest group

2021 count

336

% of total

20.0%

Change from 2016

-

Data table

Household income quartiles for St Johns Park. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Fairfield (C).

Household income quartiles for St Johns Park. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Fairfield (C).
Household income quartiles for St Johns Park. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Fairfield (C).
Category20212016Change
Count%Fairfield (C)%Count%Fairfield (C)%Countpp
Lowest group46827.8%32.4%34122.6%30.2%--
Medium lowest47828.4%29.1%40627.0%28.6%--
Medium highest40123.8%22.8%40526.9%23.7%--
Highest group33620.0%15.8%35423.5%17.5%--
Total Households1,683100.0%100.0%1,506100.0%100.0%--