Treeby (WA)

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According to evaluations of ABS demographic releases for the wider region and address listings verified by Districts post-Census, the resident count for the suburb of Treeby is projected to stand at approximately 7,499 as of May 2026. This represents an expansion of 3,285 individuals (78.0%) relative to the 2021 Census, which documented a total of 4,214 residents. This adjustment is deduced from a resident base of 7,350 calculated by Districts using the latest ABS ERP release (June 2025) combined with 950 validated new addresses added since the Census date. This population level yields a density of 910 persons per square kilometer, which aligns closely with the typical figures observed across localities analyzed by Districts. The suburb of Treeby registered a 78.0% expansion rate relative to the 2021 Census, outstripping the national rate of 9.3% and the state benchmark to position it as a regional growth leader. Population increases in this location were primarily fueled by migration from other states, which accounted for roughly of the overall population gains in recent times, though all components including overseas migration and natural increase remained positive.

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The suburb of Treeby possesses a highly educated labor force with strong representation in essential service industries, an unemployment rate of only 1.0%, and a estimated annual job growth rate of 6.6% according to aggregated statistical area statistics. By March 2026, employed residents numbered 5,036, with the local unemployment rate sitting 3.2% below the Greater Perth average of 4.2%. Labor force participation stands exceptionally high at 82.9% compared to 70.2% across Greater Perth. Census records indicate that a low proportion of residents worked from home, at 8.0%, although this figure was likely influenced by COVID-19 restrictions.

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According to the latest postcode-level ATO data released for the financial year 2023, taxpaying residents in the suburb of Treeby earn a median income of $72,694 and an average income of $86,768. These figures place the area among the top earning locations nationally, exceeding the Greater Perth median of $60,748 and average of $80,248. Factoring in Wage Price Index growth of 10.93% since the financial year 2023, current estimates correspond to approximately $80,639 for the median and $96,252 for the average as of March 2026. Census data confirms that household, family, and individual incomes are all highly ranked, positioning the area in the 90th percentile nationally. The largest income group comprises 39.9% of local taxpayers (2,992 people) earning between $1,500 and $2,999 weekly, which aligns with the broader regional trend where fall into this bracket. A substantial cohort of earn more than weekly, pointing to high levels of local affluence that support retail spending. Mortgage and rent costs account for of household income, but strong earnings keep disposable income in the th percentile, with the area ranking in the th decile of the SEIFA income index.

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Residential housing in the suburb of Treeby at the time of the latest Census consisted of 79.0% standalone houses and 21.0% semi-detached, apartment, or other dwelling types, compared to 77.8% houses and 22.1% alternative dwellings across Greater Perth. Home ownership rates in the suburb of Treeby lagged the metropolitan average, sitting at 16.0%, with the remaining properties occupied by residents with a mortgage (68.6%) or renting tenants (15.4%). The median monthly mortgage payment was higher than the metropolitan average at $2,000, while the median weekly rent stood at $450, compared to Greater Perth figures of $1,907 and $350 respectively. On a national level, local mortgage costs exceed the Australian median of $1,863, and weekly rents are significantly higher than the national benchmark of $375.

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Families make up the majority of households at 81.6%, consisting of couples with children at 41.2%, couples without children at 33.2%, and single-parent homes at 6.3%. Non-family households account for the remaining 18.4%, with single-person households representing 14.9% and group households making up 3.6% of the total. The median household size of 2.7 residents is slightly higher than the Greater Perth average of 2.6.

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Educational qualification rates in the suburb of Treeby are high, with 43.3% of residents aged 15+ holding a university degree, compared to 27.4% in the SA3 region and 27.9% across Western Australia. This profile positions the local workforce well for professional opportunities. Bachelor degrees are the most common higher qualification at 30.4%, followed by postgraduate degrees at 9.6% and graduate diplomas at 3.3%. Vocational and technical training is also well represented, with 31.7% of the population aged 15+ holding qualifications, including advanced diplomas at 11.5% and certificates at 20.2%.

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Public transport infrastructure includes 15 active stops within the suburb of Treeby, serviced by bus networks. These stops accommodate 4 different routes, delivering a combined total of 1,003 passenger journeys weekly. Transit access is rated highly, with homes located an average of 346 meters from their nearest stop. As a residential area, the majority of workers travel outward, with private vehicles remaining the primary choice for 78% of workers, and 16% commuting by train. Dwellings average 1.6 vehicles. A low proportion of 8.0% of residents worked from home according to the 2021 Census, which may reflect pandemic-era conditions.

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Health outcomes are positive throughout the suburb of Treeby, with Districts evaluations of mortality and chronic illnesses showing low rates of common health conditions, particularly among younger cohorts. Private health insurance coverage is high, with approximately 62% of residents (4,623 people) holding cover. This compares to 59.0% across Greater Perth and a national average of 55.7%.

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The suburb of Treeby exhibits high levels of cultural diversity, with 35.0% of residents speaking a language other than English at home and 46.8% born outside Australia. Christianity is the most common religious affiliation, representing 44.8% of residents. However, the most distinct religious concentration is Hinduism, which is practiced by 8.3% of the population, compared to the Greater Perth average of 2.5%.

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The median age in the suburb of Treeby is 35 years, which is younger than the Greater Perth average of 37 and the national average of 38. The 25 to 34 demographic is highly represented at 21.2% of the local population, compared to a lower concentration in the 5 to 14 cohort at 9.7%. This concentration of young adults aged 25 to 34 is higher than the national benchmark of 14.6%. Since 2021, the median age has increased by 2.8 years, rising from 32 to 35. Shifts in age distribution show the 55 to 64 group grew from 5.9% to 10.1%, and the 45 to cohort rose from to . Conversely, the to group fell from to , and children aged to declined from to . Population forecasts for suggest further shifts, with the to cohort expected to grow by , adding residents to reach .

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Treeby currently has an estimated 517 children under 5 years old, comprising approximately 287 children aged 0-2 and 191 children aged 3-4. This cohort grew by an estimated 13% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 21% by 2041 (to approximately 626 children). Meanwhile the 5-12 cohort currently amounts to 824. Recent growth has been driven by high birth rates observed in the area, with approximately 13.0 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area among the top 20% of areas assessed nationally. This rate has slowed down slightly in recent years however.