Duffy, ACT

By Lauren McCaleb · Reviewed by Dylan Duncan · Updated 30 May 2026

96/100

Suburb Score

Among Australia's more advantaged suburbs

Duffy is more socio-economically advantaged than about 96% of the 14,462 Australian suburbs we score, based on the ABS SEIFA index (raw score 1108, where about 1000 is the national average).

A socio-economic measure from ABS Census data — not a measure of how good a suburb is to live in or visit. How we calculate this.

Duffy at a glance

Population (2021): 3,395
Median age: 39
Median weekly household income: $2,593
SEIFA score: 1108
Coordinates: -35.3347, 149.0335

Duffy demographics (2021 Census)

The figures below profile Duffy using the Australian Bureau of Statistics 2021 Census; every percentage is a share of a clearly stated Census count, so each one traces back to the source. At a glance, the largest age group is mid-life (45–64) at 27%, 19% of homes are rented, and 21% of residents were born overseas.

Age profile

Age group	People	Share
Children (0–14)	657	19%
Youth (15–24)	423	12%
Young adults (25–44)	840	25%
Mid-life (45–64)	908	27%
Seniors (65+)	569	17%

Share of the 3,397 people counted by age.

Housing and households

Tenure	Dwellings	Share
Owned outright	449	37%
Owned with a mortgage	521	42%
Rented	230	19%

Dwelling type	Dwellings	Share
Houses	1,076	88%
Townhouses & semis	97	8%
Flats & apartments	51	4%

Tenure and dwelling shares are of the roughly 1,224 occupied private dwellings in Duffy.

Median weekly rent: $445
Median monthly mortgage: $2,476
Average household size: 2.7 people
Median weekly family income: $3,099
Median weekly personal income: $1,251

Community and culture

Born overseas: 697 (21%)
Speaks a language other than English at home: 496 (15%)
Aboriginal and/or Torres Strait Islander: 72 (2%)

Work and education

Completed Year 12: 2,011 (78%)
Labour-force participation: 66.4%
Unemployment rate: 3.8%
Employed full-time: 1,134
Employed part-time: 497

Source: ABS Census of Population and Housing, 2021 (General Community Profile, by Suburb and Locality). © Australian Bureau of Statistics, released under CC BY 4.0. How we group bands and derive each share is set out on our methodology page.

Weather and climate in Duffy

Based on 2014–2023 records, the warmest month in Duffy is January (average daytime high around 27.8°C) and the coolest is July (around 10.6°C). The area receives roughly 800 mm of rain across the year.

Month	Avg high	Avg low	Rain
Jan	27.8°C	14.5°C	76 mm
Feb	26.1°C	13.5°C	59 mm
Mar	23.2°C	11.8°C	73 mm
Apr	19.1°C	7.9°C	54 mm
May	14.4°C	3.3°C	46 mm
Jun	11.2°C	1.5°C	62 mm
Jul	10.6°C	0.7°C	43 mm
Aug	11.9°C	0.9°C	67 mm
Sep	15.6°C	3.2°C	63 mm
Oct	19.4°C	6.7°C	76 mm
Nov	22.2°C	9.5°C	94 mm
Dec	25.4°C	12.2°C	87 mm

Climate normals, 2014–2023 (Open-Meteo, ERA5 reanalysis).

Common questions about Duffy

Where is Duffy?

Duffy is a suburb of Australian Capital Territory, Australia.

What is the population of Duffy?

At the 2021 Census, Duffy had a population of about 3,395.

Is Duffy an advantaged area?

Duffy has an ABS SEIFA score of 1108, where about 1000 is the national average — higher scores indicate greater relative socio-economic advantage. That gives it a Suburb Score of 96 out of 100 — more socio-economically advantaged than about 96% of Australian suburbs.

What is the weather like in Duffy?

Duffy has average daytime highs of about 18.9°C and overnight lows of about 7.1°C, with roughly 800 mm of rain across the year (based on 2014–2023 climate normals).