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Willoughby City CouncilCommunity profile

Willoughby City

SEIFA by profile area

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In 2021, Castlecrag had the lowest level of Disadvantage in Willoughby City Council, with a SEIFA index score of 1,131.1.

The Willoughby City Council Socio-Economic Indexes for Areas (SEIFA) measure the relative level of socio-economic disadvantage and/or advantage based on a range of Census characteristics. Two of the SEIFA indexes: the Index of Relative Socio-Economic Disadvantage (IRSD) and the Index of Relative Socio-Economic Advantage and Disadvantage (IRSAD) can be selected below.

Index of Relative Socio-Economic Disadvantage (IRSD)

This index contains only disadvantage indicators (e.g. unemployment, low incomes or education levels, single parent families, low skilled occupations, poor English proficiency), so is best used to distinguish between disadvantaged areas, but doesn’t differentiate between those areas which are highly advantaged, and those just lacking a lot of disadvantage (with population close to the middle). This index is most commonly used for funding allocations and advocacy, because it highlights the areas of most need.

Index of Relative Socio-Economic Advantage and Disadvantage (IRSAD)

This index contains indicators of disadvantage as well as additional indicators of advantage (e.g. professional occupations, high income, higher education levels, high rent, large dwellings), Characteristics are also weighted differently than the IRSD, so areas do score differently on either measure. Often the IRSAD index will show a more "spread out" distribution with a greater range of scores from very high to very low, due to its ability to measure advantage above the average level.

SEIFA indexes are a good place to start to get a general view of the relative level of disadvantage in one area compared to others, but it is important to also look at these underlying characteristics as they can differ markedly between areas with similar SEIFA scores and shed light on the type of disadvantage being experienced.

A higher score on the index means a lower level of disadvantage, or (in the case of IRSAD only) a higher level of advantage. A lower score on the index means a higher level of disadvantage on both indexes, and a lack of advantage on the IRSAD.

The percentile column indicates the approximate position of this small area in a ranked list of Australia’s suburbs and localities in 2021. It's meant to give a broad indication of where the area sits within the whole nation. A higher number indicates a higher socio-economic status. For instance, a percentile of 72 indicates that approximately 72% of Australia’s suburbs have a SEIFA index lower than this area (more disadvantaged), while 28% are higher. This applies a comparison to suburbs even when the index concerned doesn’t relate to a suburb.

Index of Relative Socio-economic Disadvantage
Willoughby City Council's small areas and benchmark areas
Area2021 indexPercentile
Castlecrag1,131.1100
Northbridge1,121.9100
Castle Cove - Middle Cove1,121.9100
Mosman Council area1,109.598
Chatswood West - Lane Cove North1,109.198
Ku-ring-gai Council area1,108.198
Sailors Bay Ward1,107.798
Lane Cove Council area1,104.998
Roseville1,101.597
Hunters Hill Municipality1,100.697
Naremburn1,098.096
North Sydney Council area1,096.096
Willoughby1,089.494
North Willoughby - Willoughby East1,089.394
NSROC Region1,085.492
Hornsby Shire1,082.291
Middle Harbour Ward1,081.191
Willoughby City1,074.788
Naremburn Ward1,073.087
Artarmon1,061.580
City of Ryde1,055.276
St Leonards1,051.974
West Ward1,045.169
Chatswood1,034.663
Greater Sydney1,010.048
Chatswood (CBD)1,003.744
Australia1,001.242
New South Wales1,000.042
Source: Australian Bureau of Statistics, Census of Population and Housing 2021. Compiled and presented in profile.id by .id (informed decisions).
Please refer to specific data notes for more information

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