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This analysis uses ABS Statistical Areas Level 2 (SA2) boundaries, which can materially differ from Suburbs and Localities (SAL) even when sharing similar names.
SA2 boundaries are defined by the Australian Bureau of Statistics and are designed to represent communities for statistical reporting (e.g., census and ERP).
Suburbs and Localities (SAL) represent commonly-used suburb/locality names (postal-style areas) and may use different geographic boundaries. For comprehensive analysis, consider reviewing both boundary types if available.
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ABS ERP | -- people | --
2021 Census | -- people
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Marino - Seaview Downs has an estimated 10,240 residents, up from 9,703 at the 2021 Census — a change of 537 people, or 5.5%. Growth has averaged 0.9% a year over five years. Overseas migration accounts for 70.1% of that increase. That puts 839 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
According to research conducted by AreaSearch, the population of Marino - Seaview Downs stands at roughly 10,240 as of Aug 2026. This represents an expansion of 537 people (5.5%) compared to the 9,703 individuals counted in the 2021 Census. This adjustment derives from the ABS estimated resident population figure of 10,209 recorded as of June 2025 alongside 43 validated new addresses recorded following the Census. The resulting population density is 838 persons per square kilometer, aligning closely with typical benchmarks recorded across AreaSearch assessment areas. With a 5.5% expansion rate post-census, the locality trails the wider SA4 region (6.3%) by only 0.8 percentage points, highlighting sound growth momentum.
The predominant driver of local population gains has been overseas migration, accounting for roughly 70.1% of recent net additions. Projections published jointly by the ABS and Geoscience Australia in 2024, utilizing 2022 as their baseline year, are applied by AreaSearch across SA2 locations. Where SA2 coverage is absent, and across timeframes following post-2032, figures incorporate the SA State Government's 2023 Regional/LGA age-cohort projections based on 2021 numbers, using weighted aggregation methods to bridge LGA trends to SA2 geographies. Over the coming years, local demographic growth is projected to track slightly below the national statistical area median, adding 655 persons through to 2041 relative to latest annual ERP baselines, translating into an overall expansion of 6.1% over the 16 years.
Frequently Asked Questions - Population
210 new dwellings have been approved in Marino - Seaview Downs over the past five years, an average of 42 a year. That places the area in the 62nd percentile for residential development activity nationally, about 4 approvals per 1,000 residents a year. Of the 42 dwellings approved in the latest reporting year, 79% were detached houses and the rest townhouses or apartments. Figures come from ABS building approvals aggregated to this SA2 boundary and are updated monthly as the ABS releases them.
Detail
Residential building activity in Marino - Seaview Downs has averaged approximately 42 dwelling approvals annually, accumulating to 210 homes across the past 5 financial years. Between FY-22 and FY-26, the area added an average of 2.1 people per year for every newly built home over the past 5 financial years, underscoring resilient housing demand that underpins local property values. Construction quality is highlighted by an average new dwelling value of $489,000, moderately exceeding regional benchmarks. Concurrently, commercial development has progressed at a moderate pace, with $17.2 million worth of commercial building approvals logged in the current financial year.
On a per capita basis, building volume in Marino - Seaview Downs reaches approximately 59% of Greater Adelaide levels, ranking in the 64th percentile across the country. Detached houses account for 79.0% of recent construction while attached dwellings represent 21.0%, reinforcing a low-density suburban landscape favored by purchasers seeking spacious living environments. With approximately 200 people per approval, the district maintains a distinctly low-density character. According to demographic forecasts based on the most recent AreaSearch quarterly release, Marino - Seaview Downs is projected to expand by 624 residents up to 2041. At present rates of construction, future residential supply appears well-positioned to satisfy incoming demand, fostering favorable market conditions for prospective buyers while leaving room for population growth to potentially outpace current projections.
Frequently Asked Questions - Development
Development applications around Marino - Seaview Downs
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| Lodged | Address | Description | Type | Distance | Status |
|---|
SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
AreaSearch tracks 6 current infrastructure and development projects inside Marino - Seaview Downs, worth an estimated $51 million. A further 32 sit in the immediately surrounding suburbs, taking the tracked pipeline within reach of the area to $2.87 billion. 14 are already under construction and 9 are due for completion within three years. The pipeline spans residential development, education & training and sports & recreation. 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 growth and community outcomes are fundamentally shaped by capital works, strategic planning initiatives, and major infrastructure upgrades. AreaSearch has pinpointed 8 key projects poised to influence the locality. Notable undertakings include the Flagstaff Road Upgrade, Seaview Downs Primary School Redevelopment, Residential Development at 1 Greenfield Road, and the Southern Suburbs Residential Policy Code Amendment, with key details provided below.
Professional plan users can use the search below to filter and access additional projects.
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Frequently Asked Questions - Infrastructure
Flagstaff Road Upgrade
Upgrade of approximately 3.3 km of Flagstaff Road including duplication of the remaining three-lane section to a permanent four-lane divided carriageway, intersection improvements, upgraded drainage, shared walking and cycling paths, lighting and road safety improvements. Construction has been underway with staged traffic management and community updates.
Residential Development at 1 Greenfield Road
Approved development opportunity for 3 stunning two-storey townhouses with water views on a re-zoned and prepared vacant land parcel. This site was previously subject to a larger mixed-use development application.
Seaview Downs Primary School Redevelopment
Major upgrade project to deliver contemporary learning areas, new administration building, and demolition of ageing infrastructure, based on contemporary educational philosophies. The project received additional funding totaling $19.3 million.
Westfield Marion Expansion
Major $259 million expansion and renovation of Westfield Marion shopping centre by Scentre Group. Adding 52 specialty shops and 20 eateries, new ground floor mall, four-level carpark facing Diagonal Road. Expanding from 135,300sqm to 152,200sqm. Part of $500 million South Australian development pipeline including new retail spaces, fresh food precinct, dining options, and entertainment facilities. Enhanced parking and contemporary design updates. Creates up to 2,600 construction and retail jobs, strengthening position as premier southern suburbs retail destination.Introduction of paid parking for stays over 3 hours with ticketless system using numberplate recognition.
Southern Suburbs Residential Policy Code Amendment
A proposed planning amendment affecting residential zones in Southern Suburbs, including Seaview Downs, to transition areas to Hills Neighbourhood Zone and facilitate low-density infill development.
OTR Seacombe Road Redevelopment
Upgrade of the existing OTR fuel and convenience site delivering a reconfigured car park, a convenience drive-through, 2.4m acoustic fencing, and new on-site amenities including dog wash and vacuum facilities. The store page indicates drive-through and dog wash services operating, consistent with works being completed.
Seaview High School Upgrade
Facility upgrade delivering a new 2 storey multi purpose Creative Design building, a new single storey Performing Arts facility with associated performance spaces, and refurbishment of an existing building to provide contemporary STEM learning areas. Project value reported at $17.65 million. Architect: Flightpath Architects. Builder: Badge Constructions. Construction completed, with completion reported by industry sources at end of 2022.
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.
5,798 residents of Marino - Seaview Downs are employed, from a labour force of 5,919. Unemployment sits at 2.0%, with participation at 69.8%. Weighted for its industry mix, the area's sectors are forecast to grow about 6.9% nationally over five years. That reflects industry composition only and makes no allowance for local population growth. The working-day population is estimated at 7,814, about 76% of the resident population, so more people leave the area for work than travel in. Unemployment and labour force come from ABS Small Area Labour Markets, updated quarterly; the industry and occupation profile is from the 2021 Census.
Detail
The workforce in Marino - Seaview Downs is characterized by strong educational credentials, a solid presence across vital services industries, an unemployment level of merely 2.0%, and annual employment growth estimated at 5.6%. In March 2026, employed residents numbered 5,798, while the local jobless rate sat 1.8% below the Greater Adelaide benchmark of 3.8%. Labor force participation was steady at 69.8%, outpacing Greater Adelaide's 66.4%. Census figures showed just 13.3% of workers based at home, though pandemic-related lockdown measures should be kept in mind. Local resident employment is heavily clustered in health care & social assistance, construction, and education & training.
The construction sector stands out as a clear area of local concentration, capturing a workforce proportion 1.4 times that of the broader region. Conversely, manufacturing claims a smaller presence, engaging only 5.3% of Marino - Seaview Downs workers relative to 7.0% throughout Greater Adelaide. Comparing Census resident worker totals against the local working population highlights relatively constrained local job availability. An analysis of SALM and ABS statistics by AreaSearch shows that in the twelve months to March 2026, local employment expanded by 5.6% and the labor pool increased by 5.1%, lowering the unemployment rate by 0.5 percentage points. By comparison, Greater Adelaide experienced a 4.2% rise in employment, a 4.0% increase in the labor force, and a 0.2 percentage point drop in unemployment. Longer-term national labor projections released by Jobs and Skills Australia in Mar-26 provide additional context regarding future workforce trends across Marino - Seaview Downs. Nationally, total employment is projected to expand by 6.6% across five years and 13.7% over ten years, with distinct variation across specific sectors. Applying these industry growth expectations across the local employment base indicates an anticipated employment rise in Marino - Seaview Downs of 6.9% across five years and 14.2% across ten years (this represents a direct weighting extrapolation for demonstration purposes and excludes localized population modeling).
Frequently Asked Questions - Employment
Median household income in Marino - Seaview Downs is $1,821 a week (about $95,000 a year), with median personal income at $844 a week. ATO records put median taxable income at $55,275 a year against an average of $70,223. 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
Postcode-level ATO records compiled by AreaSearch for financial year 2023 indicate that earnings across the Marino - Seaview Downs SA2 exceed the nationwide benchmark, registering a median of $55,275 and an average of $70,223, outperforming Greater Adelaide's median of $54,808 and average of $66,852. Accounting for an increase of 10.17% in the Wage Price Index since financial year 2023, updated estimates as of March 2026 reach approximately $60,896 for median income and $77,365 for average income. In the 2021 Census, combined personal, family, and household earnings placed near the 56th percentile nationally.
The most prominent income tier consists of individuals earning $1,500 - 2,999 weekly, representing 33.2% of the local population (3,399 residents), comparable to the 31.8% regional proportion. Disposable funds post-housing costs remain strong at 86.6%, placing the area within the 7th decile on the SEIFA income scale.
Frequently Asked Questions - Income
Marino - Seaview Downs had 3,686 occupied dwellings at the 2021 Census, 93% detached houses and 1% apartments. 44% are owned with a mortgage, 15% rented and 40% owned outright. At that Census the median rent was $375 a week and the median mortgage repayment $1,820 a month. Rent absorbs 20.6% of household income here and mortgage repayments 23.1%. 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, the housing inventory in Marino - Seaview Downs was dominated by standalone houses at 92.9%, with other dwellings (including semi-detached units, apartments, and alternative dwellings) making up 7.1%, contrasting with Adelaide metro where houses represented 75.2% and other dwellings accounted for 24.9%. Outright home ownership stood well above metropolitan levels at 40.4%, while mortgaged properties accounted for 44.3% and rental housing comprised 15.3%. Monthly mortgage payments stood at a median of $1,820, noticeably above the Adelaide metro median of $1,562, whereas median weekly rent was recorded at $375 against $320 across Adelaide metro.
In a nationwide context, mortgage repayments in Marino - Seaview Downs fall beneath the national average of $1,863, while rental rates align directly with the national median of $375.
Frequently Asked Questions - Housing
Marino - Seaview Downs counted 3,686 households at the 2021 Census, an estimated 3,890 today, averaging 2.6 people each. 34% are couples with children, against 30% couples without children. 22% of households are people living alone, and families average 1.6 children. Household and family composition is measured only by the Census, so these are 2021 figures.
Detail
Families constitute the vast majority of local households at 75.3%, consisting of couples with children (33.9%), childless couples (30.3%), and single parent families (10.3%). The remaining 24.7% consists of non-family arrangements, primarily lone person households at 21.8% and group households at 2.9%. The median household size across the area sits at 2.6 people, slightly exceeding the 2.5 average seen across Greater Adelaide.
Frequently Asked Questions - Households
30.4% of adults in Marino - Seaview Downs hold a university qualification, including 20.4% with a bachelor degree and 7.1% with postgraduate qualifications. A further 24.0% hold a vocational qualification. 3 schools serve the area, with 2,235 enrolment places and an average ICSEA of 1,049 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
Tertiary educational attainment among Marino - Seaview Downs residents aged 15+ stands at 30.4%, placing it above the statewide benchmark of 25.7%. Bachelor degrees represent the largest single category at 20.4%, with postgraduate degrees at 7.1% and graduate diplomas at 2.9%. In addition, technical and trade training is widespread, with vocational credentials held by 35.7% of the cohort aged 15+, divided between certificates (24.0%) and advanced diplomas (11.7%). Community engagement in structured learning is substantial, with 27.7% of local inhabitants actively enrolled in study programs. This group consists of 9.6% attending primary education, 7.2% enrolled in secondary education, and 5.7% undertaking tertiary education.
Frequently Asked Questions - Education
Schools Detail
Public transport in Marino - Seaview Downs reaches 45 stops on 26 routes, timetabled for about 2,800 services a week. The typical home sits about 250 m from its nearest stop. Buses carry the largest share of public transport commuters. Households keep an average of 1.6 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
Public transport connectivity in Marino - Seaview Downs is supported by 45 active stops catering to train and bus services. These facilities are served across 26 distinct transit routes, generating 2,783 passenger services each week. Access is rated as good, with local homes typically positioned within 250 meters of the closest stop. Reflecting its suburban residential profile, outward commuting is standard: private vehicles represent the dominant mode of travel at 88%, while 7% of trips occur by train. Household motor vehicle ownership averages 1.6 per dwelling, higher than regional benchmarks.
Meanwhile, 13.3% of workers worked from home during the 2021 Census, a figure potentially influenced by prevailing COVID-19 settings. Public transport services provide an average of 397 scheduled trips each day across the collective network, corresponding to roughly 61 weekly journeys for every individual stop.
Frequently Asked Questions - Transport
Transport Stops Detail
69.7% of residents in Marino - Seaview Downs report no long-term health condition, a healthier profile than 88% of areas nationally. 4.5% need daily assistance with core activities, and 53.9% hold private health cover. The standardised death rate runs at 3.0 per 1,000 residents. Health conditions, assistance needs and insurance are 2021 Census measures; the death rate comes from current ABS releases.
Detail
Analysis of mortality statistics and chronic disease incidence by AreaSearch highlights favorable health outcomes throughout Marino - Seaview Downs, with especially low rates of prevalent chronic conditions recorded among younger demographics. Furthermore, private health insurance coverage marginally surpasses typical SA2 standards, covering approximately 54% of residents (~5,519 people). Arthritis and asthma were identified as the two most widespread medical conditions locally, impacting 8.0 and 7.7% of residents, respectively, while 69.7% of the population reported no chronic conditions whatsoever, compared with 67.9% across Greater Adelaide. Health indicators among residents aged under 65 are particularly favorable.
The senior cohort aged 65 and over comprises 21.2% of the local population (2,167 people), above the 19.1% share recorded in Greater Adelaide, with local seniors displaying strong wellness indicators despite trailing national benchmarks relative to the wider community.
Frequently Asked Questions - Health
25.6% of Marino - Seaview Downs residents were born overseas and 13.0% speak a language other than English at home. The largest reported ancestries are English (31.7%) and Australian (24.5%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.
Detail
Marino - Seaview Downs displays an above-average level of cultural diversity, with overseas-born individuals making up 25.6% of the population and 13.0% speaking a non-English language in the home. Christianity represents the most widely held religious faith, encompassing 40.9% of residents. The most noticeable deviation in group representation appears in the Other religious category, accounting for 1.3% locally versus 1.8% throughout Greater Adelaide. Looking at ancestral background based on parental birthplaces, the primary heritages represented across Marino - Seaview Downs are English at 31.7%, Australian at 24.5%, and Irish at 7.2%.
Distinct concentrations also emerge across other ancestries, including German at 5.8% (against 5.1% regionally), Polish at 1.2% (compared to 1.0% across the region), and Welsh at 0.7% (relative to 0.6%).
Frequently Asked Questions - Diversity
The median resident of Marino - Seaview Downs is 43. 22.7% 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 in Marino - Seaview Downs aligns fairly closely with wider metropolitan patterns, with the largest variance across broad age groups reaching 5.1 percentage points relative to Greater Adelaide. The estimated median age stands at 43, holding steady from the 2021 Census, which sits 4 years above Greater Adelaide's median of 39 and higher than the Australian median of 38 recorded during the same Census. Looking forward to 2041, senior demographics aged 65+ are anticipated to drive the bulk of local expansion, increasing by 279 residents (13%) to reach an aggregate of 2,447.
Frequently Asked Questions - Age
Data & MethodBoundaries, Sources & Method for Marino - Seaview Downs
9 of 14 data sections on this page were updated within the last 12 months — the newest current to Aug 2026.
Everything is aggregated to the SA2 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 last month 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 last month 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 last month headline measures · Jun 2026 baseline |
| Property sales & rents | Valuer General, Rental Board, ABS Weekly sales, quarterly rents | Aug 2026 last month all 21 measures |
| 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 Aug 2026. | ||
| Infrastructure projects | Infrastructure Australia, State agencies, Local governments Daily | Jul 2026 2 months ago all 6 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 Jul 2026. | ||
| Employment | ABS, DEWR, JSA Quarterly (ABS SALM) | Mar 2026 6 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) | Aug 2026 last month headline measures · 2021 Census baseline |
| Transport | ABS, State Transport Departments Each timetable release | Jul 2026 2 months ago headline measures · 2021 Census baseline |
| Services & amenities | Provider directories, ACECQA Continuous | Jul 2026 2 months ago 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 — 43 validated new addresses here. The headline figure is therefore a current estimate for Aug 2026, not a 2021 count (9,703 at the 2021 Census → 10,240 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 (403021060). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.