Castletown (WA)

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Evaluating demographic updates from the ABS for the wider region alongside subsequent address confirmation by Districts indicates that the suburb of Castletown has an estimated population of 4,135 as of May 2026. This represents a growth of 167 individuals (4.2%) from the 3,968 residents recorded during the 2021 Census. The calculation is derived from a resident count of 4,124 calculated by Districts using the ABS demographic release from June 2025, combined with 16 newly confirmed addresses detected after the census. This population size results in a density of 1,181 persons per square kilometer, matching typical benchmarks observed in Districts assessments. The 4.2% census-to-date expansion rate in the suburb of Castletown is within 2.3 percentage points of the broader SA3 territory (6.5%), displaying healthy growth dynamics. The expansion was largely propelled by natural increase, which was responsible for roughly 54.0% of the total demographic gains in the recent timeframe.

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Castletown features a balanced workforce with representation across white collar and blue collar employment, an unemployment rate of 1.8%, and an estimated employment growth of 3.3% over the past year, based on Districts aggregation of statistical area data. As of March 2026, 2,122 residents are in work while the unemployment rate is 1.7% below Regional WA's rate of 3.5%, and workforce participation is on par with Regional WA's 65.6%. Based on Census responses, a low 4.4% of residents were found to work from home, though Covid-19 lockdown impacts should be considered.

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According to compiled postcode tax statistics from the ATO for the 2023 financial year, taxpayers in the suburb of Castletown recorded a median income of $58,607 and an average income of $76,108. These figures are elevated on a national scale and compare to Regional WA benchmarks of $59,973 and $74,392 respectively. Factoring in Wage Price Index growth of 10.93% since the 2023 financial year, current estimated values would stand at roughly $65,013 for the median and $84,427 for the average as of March 2026. According to the 2021 Census, household, family, and individual incomes in the suburb of Castletown occupy moderate positions, falling between the 42nd and 55th percentiles. The largest income bracket contains 32.7% of the population (1,352 people) who earn between $1,500 and mirroring the regional distribution where of taxpayers fall into this same range. After housing costs are met, residents retain of their income for other living costs.

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Residential architecture in Castletown at the time of the latest Census consisted of 93.6% detached houses and 6.3% alternative dwellings such as townhouses, units, or other formats, compared to Regional WA where houses made up 88.5% and alternative dwellings accounted for 11.6%. The home ownership rate stood at 32.6%, matching the Regional WA average, while the remaining homes were mortgaged (35.7%) or occupied by tenants (31.7%). The median monthly payment for home loans was $1,717, and the median weekly rent was $300, both exceeding the Regional WA averages of $1,560 and $265. Nationally, mortgage costs in Castletown are below the Australian average of $1,863, and typical rents are much lower than the national figure of $375.

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Families make up the majority of households at 69.9%, which includes 28.2% couples with children, 30.4% couples without children, and 10.4% single parents. The remaining 30.1% consist of non-family households, with single-person households representing 27.6% and group households accounting for 2.3%. The median household size is 2.4 residents, which is slightly below the Regional WA average of 2.5.

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The local community experiences lower levels of tertiary education, with 13.2% of residents holding a university degree, compared to the national average of 30.4%. This highlights a clear opportunity for targeted educational programs. Among degree holders, bachelor degrees are the most common at 10.5%, followed by graduate diplomas at 1.4% and postgraduate qualifications at 1.3%. Vocational and technical training are highly represented, with 42.8% of residents aged 15 and over possessing qualifications from vocational institutions, consisting of advanced diplomas at 8.6% and certificates at 34.2%.

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Public transport services in Castletown include 34 active transit stops served by bus routes. These stops are linked to 1 routes, which support a total of 15 weekly passenger trips. Transport convenience is high, with residents living an average of 178 meters from the nearest stop. The suburb is primarily a residential commuter hub, with 94% of residents traveling by car. Households own an average of 1.6 vehicles. A small proportion of residents (4.4%) worked from home, according to 2021 Census figures, which were potentially influenced by pandemic conditions.

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Health indicators point to favorable conditions for Castletown residents, with Districts evaluations of mortality and medical histories showing statistics that match national averages. The prevalence of common health conditions is standard across all age ranges, and private medical insurance coverage is high, encompassing roughly 57% of the community (~2,374 people).

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Castletown registers lower levels of multicultural diversity, with citizens making up 85.5% of the community, 87.1% of residents born in Australia, and 95.1% of households speaking only English. Christianity is the dominant religious affiliation, representing 42.2% of the local population. The most distinct statistical anomaly is in Judaism, which is recorded at none of the population, matching the regional rate of none.

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Castletown has a median age of 37, which is slightly younger than the Regional WA average of 40 and aligns closely with the Australian median of 38 years. Compared to regional averages, the suburb has a higher concentration of young people aged 15 to 24 (12.3% of residents) and a lower proportion of adults aged 55 to 64 (10.3%). Since 2021, the 35 to 44 age bracket has risen from 13.4% to 15.4% of the population, while the 45 to 54 cohort decreased from 12.2% to 11.1%. Long-term projections indicate that Castletown's age structure will shift by 2041. The 25 to 34 age bracket is expected to grow significantly, increasing by individuals () from to while the to and to age cohorts are projected to contract.

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Castletown currently has an estimated 260 children under 5 years old, comprising approximately 140 children aged 0-2 and 93 children aged 3-4. This cohort grew by an estimated 6% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 25% by 2041 (to approximately 324 children). Meanwhile the 5-12 cohort currently amounts to 420. While growth has been positive birth rates observed in the area have been moderate, with approximately 10.2 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area within the middle tier nationally. This rate has slowed down slightly in recent years however.