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SAL
: Willoughby (C)
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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 North Willoughby, accounting for 41.2%.

Section overview

Household income quartiles

North Willoughby - Households (Enumerated)

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

Household income quartiles snapshot

2021 distribution by category for North Willoughby, with comparison markers for Willoughby (C).

North Willoughby
Willoughby (C)

Lowest group

Medium lowest

Medium highest

Highest group

Data table

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

Household income quartiles for North Willoughby. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Willoughby (C).
Household income quartiles for North Willoughby. Household income quartiles. 2021 and 2016 counts, percentages, and change compared with Willoughby (C).
Category20212016Change
Count%Willoughby (C)%Count%Willoughby (C)%Countpp
Lowest group25017.9%16.6%23617.9%16.3%--
Medium lowest26619.0%18.3%22417.0%16.6%--
Medium highest30621.9%22.2%30623.2%23.4%--
Highest group57541.2%42.9%55141.8%43.7%--
Total Households1,397100.0%100.0%1,317100.0%100.0%--