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This analysis uses Suburbs and Localities (SAL) boundaries, which can materially differ from Statistical Areas (SA2) even when sharing the same name.
SAL boundaries are defined by Australia Post and the Australian Bureau of Statistics to represent commonly-known suburb names used in postal addresses.
Statistical Areas (SA2) are designed for census data collection and may combine multiple suburbs or use different geographic boundaries. For comprehensive analysis, consider reviewing both boundary types if available.
est. as @ -- *
2021 Census | -- people
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St Marys (SA) has an estimated 3,330 residents, up from 3,010 at the 2021 Census — a change of 320 people, or 10.6%. Growth has averaged 2.0% a year over five years. Overseas migration accounts for 79.0% of that increase. That puts 1,820 residents on each square kilometre. Population is estimated from ABS Estimated Resident Population releases and GNAF address data, re-based from the 2021 Census and updated annually.
Detail
As of Aug 2026, the suburb of St Marys (SA) has an estimated resident population of approximately 3,330, according to AreaSearch evaluations combining broader ABS demographic updates with post-Census validated addresses. Compared to the 3,010 people recorded in the 2021 Census, this marks an expansion of 320 people (10.6%). This upward trajectory stems from AreaSearch's calculation of 3,314 residents following the ABS ERP release in June 2025 alongside 14 validated new addresses recorded post-Census. With a density of 1,819 persons per square kilometer, the locality sits above the nationwide average tracked by AreaSearch.
Furthermore, the 10.6% increase achieved by the suburb of St Marys (SA) outpaced both the SA3 area (5.6%) and the wider SA4 region, establishing it as an area pacesetter. Inbound overseas migration served as the primary growth catalyst, generating roughly 79.0% of recent population gains. Long-term demographic modeling by AreaSearch incorporates 2024 ABS/Geoscience Australia SA2 projections based on 2022 benchmarks. Where SA2 coverage is absent, as well as for the era following post-2032, models integrate the 2023 SA State Government Regional/LGA age-cohort series (utilizing 2021 baselines) via a weighted aggregation technique spanning LGA to SA2 geographies. Looking ahead, the suburb of St Marys (SA) is slated for above-median growth relative to national benchmarks, with aggregated SA2 figures pointing to an addition of 571 persons to 2041, representing a cumulative 16-year increase of 16.7%.
Frequently Asked Questions - Population
79 new dwellings have been approved in St Marys (SA) over the past five years, an average of 15 a year. That is 4.9 approvals per 1,000 residents. Approvals are currently running at an annualised 9, well below that longer-run average. Figures come from ABS building approvals aggregated to this Suburb (SAL) boundary and are updated monthly as the ABS releases them.
Detail
ABS residential building approvals compiled by AreaSearch show that St Marys has averaged roughly 15 approved dwellings annually, amounting to around 79 homes across the preceding 5 financial years. Within FY-25 to date, 9 approvals have been logged. Housing construction is substantially trailing local demand, evidenced by an average intake of 3.4 people per year for every home built over the 5 financial years between FY-21 and FY-25. This shortfall exerts upward pressure on home prices amidst heightened buyer demand, while recent residential projects reflect an average construction cost of $406,000.
On the commercial front, approvals total $2.5 million this financial year, underscoring subdued commercial building activity. On a per-capita basis, residential approvals in St Marys run 53.0% higher than Greater Adelaide, providing purchasers with varied housing choices despite a recent moderation in construction momentum. Newly built stock is divided between detached homes (62.0%) and attached dwellings (38.0%), highlighting a rising footprint of medium-density formats that span standard standalone residences and cost-effective compact designs across different price tiers. Indicative of an established urban fabric, the suburb averages roughly 340 people per dwelling approval. Based on the latest AreaSearch quarterly estimate, St Marys is projected to gain 555 residents by 2041. Although current residential building rates are tracking reasonably alongside future expansion, incoming purchasers may face intensifying competition as the local population expands.
Frequently Asked Questions - Development
Development applications around St Marys (SA)
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| Lodged | Address | Description | Type | Distance | Status |
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SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
AreaSearch tracks 19 current infrastructure and development projects close to St Marys (SA), worth an estimated $1.5 billion. 10 are already under construction and 4 are due for completion within three years. The pipeline spans residential development, education & training and transport & logistics. Records are compiled from Infrastructure Australia, state agencies, council planning portals and public announcements, reviewed and updated daily, then ranked by proximity, construction stage, completion horizon and project scale.
Detail
Local infrastructure projects and regional planning programs play a critical role in shaping area performance. AreaSearch has pinpointed 1 major initiative with potential local effects. Prominent regional developments include the Thrive Tonsley - Junction Australia Housing Development, Flinders Medical Centre Southern Redevelopment Stage 1 (Acute Services Building), Springbank Secondary College upgrade, and Tram Grade Separation Projects, with primary details outlined below.
Professional plan users can use the search below to filter and access additional projects.
INFRASTRUCTURE SEARCH
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Frequently Asked Questions - Infrastructure
Flinders Medical Centre Southern Redevelopment Stage 1 (Acute Services Building)
The Flinders Medical Centre Stage 1 Southern Redevelopment is a major $572 million public healthcare expansion delivered by Built Environs for SA Health and the Department for Infrastructure and Transport. The centerpiece is a seven-storey Acute Services Building adding 98 clinical beds, two 32-bed inpatient wards, a 16-bed satellite ICU, eye surgery suites, and four operating theatres. The building topped out in mid-2026 and is scheduled to open to patients in early 2028.
Tonsley Innovation District
61-hectare renewal of the former Mitsubishi site into a mixed-use innovation precinct led by Renewal SA with partners including Flinders University, TAFE SA and Peet (Tonsley Village). The district continues staged delivery of commercial, education, research and residential assets under a 2012-2028 masterplan.
Thrive Tonsley - Junction Australia Housing Development
A $70 million social and youth housing precinct by Junction Australia within the Tonsley Innovation District. Stage 1 consists of 50 energy-efficient apartments (7.5-star rating) and is nearing completion with Junction's head office scheduled to open to the public on May 25, 2026. Stage 2 will add 63 apartments in an 8-storey building. The development serves as a community hub featuring a cafe, co-working spaces, and support services for approximately 10,000 South Australians annually. The project is supported by the Federal Social Housing Accelerator Program and built by Schiavello.
Hotel Panorama
Hotel Panorama is a $60 million, five-storey hospitality destination by the Hurley Hotel Group. Strategically located to support visitation for Flinders University, Flinders Medical Centre, and the Tonsley Innovation Precinct, the venue features 77 accommodation rooms, including 26 serviced apartments and two premium suites. The ground floor hosts a casual cafe bar, restaurant with a sunken fire lounge, and the Sideline sports bar. The fifth floor features a rooftop bar called Wonderland with a gold disco ball pizza oven and panoramic views from the coast to the Adelaide Hills.The project replaced the former Tonsley Hotel and officially opened on May 8, 2026.
Tonsley Administration Hub Redevelopment Opportunity
A 2.578-hectare commercial development opportunity to redevelop or refurbish the existing 1960s office building at the entrance of the Tonsley Innovation District. The site offers 12,308 square meters of lettable space and almost 200 meters of frontage to South Road.
Tonsley Technical College
A new technical college within the Tonsley Innovation District, nearing completion as part of Flinders University's Stage 2 development. It contributes to the district's focus on education and training in various high-value industry sectors.
Tonsley Retail Precinct
A new mixed-use hub valued at $47 million, bringing diverse retail, commercial, and wellbeing offerings to Tonsley. Plans include a multi-level gym (V2FIT), indoor bouldering gym, food and beverage outlets (pizza & wine bar, cafe, delicatessen), an independent supermarket, specialty shops, allied health services, and 5700my of new office space. Development approval for the first stage has been secured, with construction planned to commence late 2024.
Little Bang Brewery at Tonsley Boiler House
Redevelopment of Tonsley's Boiler House into a new hospitality venue. Plans include a micro-brewery, bar, restaurant, and bottle shop, aiming to open by 2026. This project is set to enhance the amenity and social offerings within the Tonsley Innovation District.
1,934 residents of St Marys (SA) are employed, from a labour force of 1,999. Unemployment sits at 3.3%, with participation at 72.5%. Weighted for its industry mix, the area's sectors are forecast to grow about 7.3% nationally over five years. That reflects industry composition only and makes no allowance for local population growth. Unemployment and labour force come from ABS Small Area Labour Markets, updated quarterly; the industry and occupation profile is from the 2021 Census.
Detail
St Marys features a skilled labour market with substantial representation across essential services, an unemployment rate standing at just 3.3%, and a 5.9% annual expansion in employment based on AreaSearch statistical aggregations. As of March 2026, 1,934 residents are employed, the local jobless rate sits 0.6% lower than Greater Adelaide's 3.8%, and the participation rate reaches an elevated 72.5% (compared to 66.4% across Greater Adelaide). Census findings indicated that a modest 10.2% of workers operated from home, though this figure reflects Covid-19 restrictions. Local workforce engagement is heavily concentrated within health care & social assistance, construction, and education & training.
The suburb exhibits a pronounced specialization in health care & social assistance, employing 1.4 times the regional proportion. Conversely, public administration & safety accounts for a smaller share, employing 5.2% locally versus 7.4% across the broader region. An above-average local jobs market is reflected in a Census ratio of 0.7 workers for every resident. Analysis of ABS and SALM data by AreaSearch reveals that across the 12 months to March 2026, resident employment expanded by 5.9% alongside a 5.5% growth in the labour force, reducing unemployment by 0.4 percentage points. Across Greater Adelaide over the same period, employment increased by 4.2%, the workforce rose by 4.0%, and unemployment contracted by 0.2 percentage points. Longer-term employment expectations can be evaluated using Jobs and Skills Australia's Mar-26 national forecasts. Across the country, job numbers are projected to grow by 6.6% across five years and 13.7% across ten years, with performance varying by industry. Applying these sector-specific forecasts to the St Marys occupational profile indicates prospective employment growth of 7.3% over five years and 15.1% over ten years (representing a weighted baseline calculation that does not incorporate local demographic projections).
Frequently Asked Questions - Employment
Median household income in St Marys (SA) is $1,490 a week (about $77,000 a year), with median personal income at $785 a week. ATO records put median taxable income at $52,966 a year against an average of $64,830. Household income is from the 2021 Census; taxable income is from ATO Taxation Statistics for the latest financial year available, indexed forward using the ABS Wage Price Index.
Detail
Based on AreaSearch's aggregation of postcode ATO statistics for financial year 2023, taxpayers in the suburb of St Marys recorded a median income of $52,966 and an average income of $64,830. These figures track below the Australian standard and compare against $54,808 (median) and $66,852 (average) across Greater Adelaide. Adjusting for a 10.17% increase in the Wage Price Index since financial year 2023, modelled estimates as of March 2026 reach approximately $58,353 for median earnings and $71,423 for average earnings. According to Census 2021 benchmarks, personal, family, and household earnings sit in the 35th to 46th percentiles.
Looking at distribution, 34.6% of residents (1,152 individuals) earn between $1,500 - 2,999, which aligns closely with the 31.8% regional proportion. Housing affordability remains constrained, with 83.1% of income uncommitted (ranking in the 34th percentile), while the area occupies the 5th decile on the SEIFA income index.
Frequently Asked Questions - Income
St Marys (SA) had 1,244 occupied dwellings at the 2021 Census, 66% detached houses and 11% apartments. 39% are owned with a mortgage, 37% rented and 25% owned outright. At that Census the median rent was $285 a week and the median mortgage repayment $1,654 a month. Rent absorbs 19.1% of household income here and mortgage repayments 25.6%. Dwelling stock, tenure and housing costs are 2021 Census measures — the only source that counts dwellings at this boundary size.
Detail
According to the latest Census, housing stock in St Marys was divided between separate houses (66.3%) and other dwellings (33.7%), including apartments and semi-detached units, compared to 75.2% houses and 24.9% other dwellings across metropolitan Adelaide. Outright home ownership in St Marys reached 24.6%, trailing Adelaide metro, while 38.6% of homes were mortgaged and 36.8% were rented. The median monthly mortgage payment stood at $1,654 (higher than Adelaide metro's $1,562), whereas median weekly rent was $285 (lower than the metropolitan rate of $320). When compared to national figures, local mortgage repayments are well below the Australian median of $1,863, and weekly rents sit significantly lower than the national benchmark of $375.
Frequently Asked Questions - Housing
St Marys (SA) counted 1,244 households at the 2021 Census, an estimated 1,376 today, averaging 2.4 people each. 28% are couples with children, against 23% couples without children. 32% of households are people living alone, and families average 1.3 children. Household and family composition is measured only by the Census, so these are 2021 figures.
Detail
Families constitute 62.8% of all local households, divided between couples with children (28.0%), childless couples (23.1%), and single-parent arrangements (10.4%). The remaining 37.2% comprises non-family residences, consisting of single-person households (31.5%) and group accommodation (5.7%). The median household size of 2.4 individuals is slightly below the 2.5 average for Greater Adelaide.
Frequently Asked Questions - Households
36.4% of adults in St Marys (SA) hold a university qualification, including 24.2% with a bachelor degree and 9.9% with postgraduate qualifications. A further 19.6% hold a vocational qualification. 2 schools serve the area, with 191 enrolment places and an average ICSEA of 1,075 against a national benchmark of 1,000. Qualifications come from the 2021 Census; school enrolments, ICSEA and results come from ACARA's current release.
Detail
Residents of St Marys exhibit high levels of education, with 36.4% of individuals aged 15+ holding tertiary degrees, outperforming both SA (25.7%) and the SA4 region (28.1%). This qualified workforce provides strong alignment with knowledge-intensive industries. Bachelor degrees represent 24.2% of qualifications, followed by postgraduate degrees at 9.9% and graduate diplomas at 2.3%. Vocational qualifications are also prevalent, with 29.6% of residents aged 15+ holding technical credentials, including certificates (19.6%) and advanced diplomas (10.0%). Formal study participation is widespread across St Marys, with 30.2% of the local population currently enrolled in education.
Among these students, 9.7% attend higher education, 8.5% are in primary school, and 5.2% are enrolled in secondary school.
Frequently Asked Questions - Education
Schools Detail
Public transport in St Marys (SA) reaches 17 stops on 30 routes, timetabled for about 2,200 services a week. The typical home sits about 210 m from its nearest stop. Buses carry the largest share of public transport commuters. Households keep an average of 1.2 vehicles. Stop and service counts are built from operators' published GTFS timetables and refresh with each timetable release; vehicle ownership is from the 2021 Census.
Detail
St Marys is served by 17 active public transport stops focused entirely on bus transport. These facilities are linked by 30 separate routes that generate 2,219 weekly scheduled trips. Accessibility across the suburb is favourable, with residents situated an average of 211 meters from their closest transit stop. The local population mostly commutes outward, with private vehicles accounting for 81% of journeys and bus travel representing 11%. Car ownership sits at 1.2 vehicles per dwelling, below the broader regional standard. In addition, 10.2% of the local workforce reported working from home in the 2021 Census, subject to COVID-19 pandemic influences.
Transit schedules provide an average of 317 departures daily across all available routes, resulting in roughly 130 weekly trips for each transport stop.
Frequently Asked Questions - Transport
Transport Stops Detail
72.8% of residents in St Marys (SA) report no long-term health condition. 5.8% need daily assistance with core activities, and 52.6% hold private health cover. The standardised death rate runs at 6.2 per 1,000 residents. Health conditions, assistance needs and insurance are 2021 Census measures; the death rate comes from current ABS releases.
Detail
Mortality figures and chronic illness metrics compiled by AreaSearch indicate notable health challenges in St Marys, with common health conditions somewhat prevalent across both younger and older age cohorts. Private health insurance uptake slightly exceeds the typical SA2 area, encompassing approximately 53% of the community (~1,752 people). Asthma and mental health issues represent the primary reported health conditions in St Marys, affecting 6.8% and 8.2% of residents respectively. Conversely, 72.8% of the community reported having no chronic medical ailments, outpacing the 67.9% recorded across Greater Adelaide. Overall health outcomes across working-age residents align with typical patterns.
The suburb includes 439 people aged 65 and over (13.2% of the population), which is lower than Greater Adelaide's 19.1%, with national health comparisons sitting broadly in line with broader benchmarks.
Frequently Asked Questions - Health
35.4% of St Marys (SA) residents were born overseas and 34.9% speak a language other than English at home, more culturally diverse than 79% of areas nationally. The largest reported ancestries are English (23.3%) and Australian (20.7%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.
Detail
St Marys exhibits notable cultural diversity, with 35.4% of residents born abroad and 34.9% utilizing a non-English language at home. Christianity represents the most common faith, accounting for 43.7% of the community. The most distinct variance appears in the Other religious category, which constitutes 2.8% locally compared to 1.8% across Greater Adelaide. In terms of ancestral background (based on parental place of birth), the primary ancestries in St Marys are English (23.3%), Australian (20.7%), and Other (14.8%), with the latter substantially exceeding the regional baseline of 9.7%. Other distinct ethnic groups show higher representation than the surrounding region, including Indian ancestry at 4.9% (vs 2.3%), Greek at 3.3% (vs 2.0%), and Russian at 0.5% (vs 0.3%).
Frequently Asked Questions - Diversity
The median resident of St Marys (SA) is 35, younger than 76% of areas nationally. 32.4% of residents are aged 15 to 34. Age cohorts are not raw Census counts: the Census split is re-based to the latest ABS population estimates and state projections.
Detail
The age distribution of St Marys features a smaller proportion of seniors relative to Greater Adelaide. Young to middle aged adults (25 - 44) make up 37.4% of residents as at August 2026, compared to 28.9% across the wider metropolitan area, while retiree and elderly cohorts (65+) represent 13.2% against Greater Adelaide's 19.1%. As at August 2026, the estimated median age is 35, matching the 2021 Census figure and sitting 4 years below Greater Adelaide's 39 at that Census. Since the Census, the share of middle aged and young retiree cohorts (45 - 64) reduced from 21.5% to an estimated 20.4%.
Moving toward 2041, the largest numerical gain is anticipated in the 45 - 64 cohort, increasing by 162 residents (24%) to 841, while the fastest percentage rise will occur in the 65+ age group, advancing 25% to 550.
Frequently Asked Questions - Age
Data & MethodBoundaries, Sources & Method for St Marys (SA)
9 of 14 data sections on this page were updated within the last 12 months — the newest current to Oct 2026.
Everything is aggregated to the Suburb (SAL) boundary shown above, on a 2021 Census baseline. Only 3 sections — housing, households and cultural diversity — still wait on the 2026 Census.
The ledger — source, cycle and currency by section
| Section | Source & update cycle | Currency |
|---|---|---|
| Updated within the last 12 months 9 sections | ||
| Population | ABS, GNAF, Geoscience Australia Annual (ABS ERP) | Aug 2026 2 months ago headline measures · 2021 Census baseline |
| Re-based to the ABS Estimated Resident Population (June 2025 release) and updated with new dwellings from GNAF address data. Current to Aug 2026, with the 2021 Census supplying the small-area baseline. | ||
| Age profile | ABS, Geoscience Australia, State governments Annual | Aug 2026 2 months ago headline measures · 2021 Census baseline |
| Age cohorts are re-based to the latest ABS population estimates and state projections, current to Aug 2026. Each cohort is held as a Census baseline and a current estimate. | ||
| Development & approvals | ABS, GNAF Monthly (ABS approvals) | Aug 2026 2 months ago headline measures · Jul 2026 baseline |
| Property sales & rents | Valuer General, Rental Board, ABS Weekly sales, quarterly rents | Oct 2026 this month headline measures · Sep 2026 baseline |
| Sales from the state Valuer General register, refreshed weekly, and rents from quarterly rental bond lodgements. Both are read live each time this page loads, current to Oct 2026. | ||
| Infrastructure projects | Infrastructure Australia, Local governments Daily | May 2026 5 months ago all 2 projects tracked here |
| Project pipeline maintained continuously from Infrastructure Australia, state agencies, local government and public announcements. Records are added and revised daily; this area was last updated May 2026. | ||
| Employment | ABS, DEWR, JSA Quarterly (ABS SALM) | Mar 2026 7 months ago headline measures · 2021 Census baseline |
| Unemployment and labour force from ABS Small Area Labour Markets, current to Mar 2026. The growth outlook applies Department of Employment (now Jobs and Skills Australia) forecasts for all 19 industry divisions to the local industry mix, so it measures sector composition rather than local expansion and makes no allowance for population growth. Job demand comes from the same agency via its Internet Vacancy Index; industry and occupation structure from the 2021 Census. | ||
| Education | ABS, ACARA Annual (ACARA) | Sep 2026 last month headline measures · 2021 Census baseline |
| Transport | ABS, State Transport Departments Each timetable release | Jul 2026 3 months ago headline measures · 2021 Census baseline |
| Services & amenities | Provider directories, ACECQA Continuous | Sep 2026 last month all 14 measures |
| Annual and financial-year sources 2 sections | ||
| Income | ABS, ATO Annual (ATO) | FY 2023 3 years ago headline measures · 2021 Census baseline |
| ATO taxable income statistics for FY 2023, indexed forward using the Wage Price Index. Census household income provides the distribution detail. | ||
| Health | ABS, ATO Annual | 2024 2 years ago headline measures · 2021 Census baseline |
| Census-measured — next update: 2026 Census 3 sections No more current small-area source exists for these, so they are labelled as Census-measured rather than implied to be current. | ||
| Housing | ABS 5-yearly (Census) | 2021 Census next update 2026 all 30 measures |
| Households | ABS 5-yearly (Census) | 2021 Census next update 2026 all 18 measures |
| Cultural diversity | ABS, Geoscience Australia 5-yearly (Census) | 2021 Census next update 2026 all 44 measures |
"Currency" is the most recent release feeding that section. Where the Census supplies the structural baseline underneath a current headline figure, the row says so.
How the numbers are built
Population
The Census provides the small-area baseline, aggregated from mesh blocks to this boundary. It is then re-based to the ABS Estimated Resident Population (June 2025 release), and new dwellings built since Census night are counted from address data — 14 validated new addresses here. The headline figure is therefore a current estimate for Aug 2026, not a 2021 count (3,010 at the 2021 Census → 3,330 now). Annual growth rates are compound (CAGR), not simple averages.
Age profile
Cohort shares are not raw Census counts. Every cohort is held as a pair — the Census baseline and a current estimate — and the split is re-based using ERP and state population projections, current to Aug 2026. Median age is the Census median plus modelled change since. Charts that show both are labelled "2021 Census vs Current Estimate".
Property sales
Sourced from the state valuation authority's sales register — current, not Census, and refreshed weekly. Medians are calculated from settled transactions in the period shown; periods with very low transaction counts are flagged or suppressed, because a handful of sales can move a median substantially.
Rents
Derived from state rental bond lodgement data, by dwelling type and bedroom count. Bonds are lodged at the start of a new tenancy, so this reflects new lettings, not the whole rented stock.
Development & infrastructure
Building approvals come from current ABS releases; development applications are collected from council and state planning portals; the infrastructure pipeline is compiled from Infrastructure Australia and local government sources. Applications are matched to this boundary by address or coordinates, so very recent lodgements may not yet appear.
Employment & income
Industry and occupation structure comes from the Census, but the headline labour-market indicators do not. Unemployment and labour force are derived from ABS Small Area Labour Markets (quarterly). The employment outlook applies Department of Employment forecasts for all 19 industry divisions to this area's own industry mix (the agency is now Jobs and Skills Australia), as does the Internet Vacancy Index used for job demand. Because it is weighted on industry composition alone, that outlook carries no allowance for local population growth — in fast-growing areas the real rise in local jobs will typically be higher. Income combines Census household income with ATO taxable-income statistics for FY 2023, indexed forward using the Wage Price Index.
Education, transport & amenities
School enrolments, ICSEA and performance come from ACARA's current release, not the Census. Public transport stops and service frequency are derived from GTFS timetable feeds published by state transport departments. Services and amenities are proximity and count scores built from provider directories, refreshed on their own cycle. The Census contributes only the travel-to-work and qualification measures.
Rankings and benchmarks. Where we rank this area, the comparison set is every area of the same boundary type — suburbs against suburbs, SA2s against SA2s. Benchmarks compare this area against its greater capital city region and the national figure for the same measure and period.
Limits worth knowing. Small areas carry larger error margins, and the ABS introduces small random adjustments to Census counts to protect confidentiality — so totals may not sum exactly. Estimates re-based from regional data describe the area's expected trajectory, not a direct count of it. Figures are indicative for research and are not financial, planning or valuation advice.
Cross-check us. The Census baseline for this boundary is at ABS 2021 Census QuickStats (SAL41373). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.