St Marys
Renters shape St Marys more than owners: 54.2% of homes are rented, higher than the 27.4% with a mortgage and 18.4% owned outright. The suburb has 13,256 residents, a median age of 34, which is 6 years below national, and 36.9% born overseas, 15.3 percentage points above national. Compared with nearby Penrith and Mount Druitt, St Marys reads as a denser middle-ring centre because only 51.3% of dwellings are separate houses, while semi-detached homes and apartments form a large share.
Population
13,256
Median Age
34.0
Household IncomeiMedian weekly household income (ABS Census)
$1,437/wk
DAs (12 months)iDevelopment Applications lodged in the past year
122
Median House
$703K
2024-2025 (PSI derived)
Homebuyers get a lower entry point than many Sydney markets, with a median house price of $703,319 and a latest quarterly price of $820,000. The latest price is 0.0% below peak because 2025 is also the recorded peak, after a 30.2% rise from 2024. The mix suits practical buyers: 51.3% separate houses, 30.0% semi-detached and 18.6% apartments. Three-bedroom homes dominate at 48.8%, while mortgage costs at 29.7% of income sit only slightly higher than the 25.4% rent-to-income figure.
For Buyers
Homebuyers get a lower entry point than many Sydney markets, with a median house price of $703,319 and a latest quarterly price of $820,000. The latest price is 0.0% below peak because 2025 is also the recorded peak, after a 30.2% rise from 2024. The mix suits practical buyers: 51.3% separate houses, 30.0% semi-detached and 18.6% apartments. Three-bedroom homes dominate at 48.8%, while mortgage costs at 29.7% of income sit only slightly higher than the 25.4% rent-to-income figure.
For Investors
St Marys has a strong tenant base because 54.2% of households rent, higher than both mortgaged households at 27.4% and outright owners at 18.4%. The typical rent is $365 per week, while vacancy is 7.6%, so investors should price carefully rather than assume tight conditions. Development activity is high, with 113 applications in 12 months, well above the 20-application marker, including storage, infrastructure and warehouse uses that point to continuing employment-land demand.
Development Activity
Total DAs
558
Last 12 Months
122
YoY ChangeiYear-over-year change in DA lodgements
+2.5%
Avg DA CostiAverage estimated cost per DA in the past year
N/A
Monthly DA Lodgements
DA Categories
Schools in St Marys iICSEA: school advantage index. 1000 = national avg, higher = more advantaged
St Marys Senior High School
11-12 · 926 students
Our Lady of The Rosary Primary School
K-6 · 368 students
St Marys Public School
P-6 · 258 students
Oxley Park Public School
P-6 · 601 students
St Marys South Public School
K-6 · 319 students
Demographics
The population is younger and more internationally connected than the national profile. Median age is 34, 6 years below national, while 36.9% of residents were born overseas, 15.3 percentage points above national. University attainment is 26.6%, 3.5 points below national, and household size is 2.5, matching national. English ancestry accounts for 2,916 people, Filipino for 825 and Irish for 727; Christianity records 6,874 people, with Islam at 730 and Hinduism at 681.
Age Distribution
Bedrooms
Dwelling Structure
51.3%
Houses
30.0%
Townhouse
18.6%
Apartment
Tenure
Housing in St Marys is varied rather than purely detached. Compared with nearby Penrith and Mount Druitt, the local mix is more compact: 51.3% separate houses sit beside 30.0% semi-detached homes and 18.6% apartments. The quarterly price series moved from $630,000 in 2024 to $820,000 in 2025, a 30.2% gain and 30.2% one-year CAGR, with the latest equal to the peak. Ownership is lower than renting, at 18.4% owned outright, 27.4% mortgaged and 54.2% rented.
Median House Price Trend
Source: State Valuer-General
Mortgage / mo
$1,847
Rent / wk
$365
HH Size
2.5
Personal Income / wk
$754
Vacancy Ratei% of dwellings unoccupied on Census night (ABS 2021)
7.6%
Unoccupied
391
Rent / IncomeiMedian rent as % of household income. Over 30% = housing stress
25.4%
Mortgage / IncomeiMedian mortgage as % of household income. Over 30% = housing stress
29.7%
Community Profile
Languages Spoken at Home
Ancestry
Household Composition
19.5%
Couples, no children
9,713
Total families
Economy & Employment
Healthcare is the largest local work sector at 20.6% and 634 workers, followed by construction at 10.0%, retail at 8.7%, education at 8.6% and transport at 8.2%. Occupations lean practical, with 923 machinery and driver workers, 810 clerical and admin workers and 713 professionals. Unemployment is 8.3% and participation is 47.0%. IEO 889, IER 901, IRSD 895 and IRSAD 892 are all decile 1 nationally, lower than most suburbs because incomes, education and resources all weigh on the index.
Socio-Economic Indexes (SEIFA)iABS index ranking suburbs from 1 (most disadvantaged) to 10 (most advantaged)
Full-time
67.3%
Part-time
24.4%
Participation
47.0%
Employed
4,498
Occupations
Top Industries
University
26.6%
Postgraduate
7.2%
Born Overseas
36.9%
Dwellings
4,763
Transport to Work
Daily life is car oriented: 84.1% of workers drive, far higher than the 5.0% using public transport and 2.5% walking or cycling. School choice is a strength, with 6 local schools across Government and Catholic sectors and an ICSEA range from 922 to 1052. St Marys Senior High School leads at ICSEA 1052 with 926 students, while Our Lady of The Rosary Primary records ICSEA 1032 and 368 students. Crime comparisons should be checked at street level, especially around busy retail and transport areas.
Drive
84.1%
Public Transport
5.0%
Walk / Cycle
2.5%
Work from Home
N/A
National Ranking iPercentile rank among ~15,000 AU suburbs. 90% = higher than 90% of suburbs
How St Marys compares to ~15,000 Australian suburbs
Frequently Asked Questions
Is St Marys a good suburb to live in?
St Marys can suit budget-conscious buyers and renters who want a younger, urban western Sydney setting. It has 13,256 residents, median age 34 and a high 54.2% rental share, so the feel is active and more transient than owner-heavy suburbs.
What is the median house price in St Marys?
The median house price is $703,319. The quarterly price series shows $630,000 in 2024 and $820,000 in 2025, a 30.2% increase, with the latest quarter also matching the recorded peak.
What schools are in St Marys?
There are 6 local schools. St Marys Senior High School has ICSEA 1052 and 926 students, Our Lady of The Rosary Primary has ICSEA 1032 and 368 students, and the local ICSEA range runs from 922 to 1052.
Is St Marys safe?
Safety varies by pocket, so check current NSW crime maps and inspect streets at different times. With 13,256 residents across 9.7 sq km and busy retail and transport areas, street-level conditions matter more than a broad suburb label.
Is St Marys good for property investment?
St Marys has investor appeal because 54.2% of households rent and the typical rent is $365 per week. The caution is vacancy at 7.6%, so yield assumptions should allow for leasing competition and new supply.
How is St Marys's population changing?
St Marys has a current population of 13,256 and a younger profile, with median age 34. Change is being pushed by renter demand, 36.9% overseas-born residents and 113 development applications over the past 12 months.
What languages are spoken in St Marys?
English is joined by several community languages. The largest recorded non-English language groups include Arabic with 192 speakers, Samoan with 116, Hindi with 96, Punjabi with 95 and Urdu with 78.
Is there much development in St Marys?
Yes. There were 113 development applications in 12 months, including storage premises, infrastructure and warehouse or distribution proposals. That level is above the 20-application marker and points to continuing local change.
How to read these comparisons
Phrases like "above the national average" reference the unweighted median across Australian suburbs with more than 1,000 residents, not population-weighted national figures. Suburb-level medians are more useful for ranking suburbs against each other; ABS census headlines are population-weighted (so dominated by Sydney and Melbourne) and can read very differently.
Current baseline (refreshed 2026-05-10): median age 40, university-educated 30.1%, born overseas 21.6%, average household size 2.5 people.
Data sources: ABS 2021 Census (demographics, income, tenure), state Valuer-General (house prices), Department of Jobs SALM (unemployment), ACARA (school ICSEA), state Crime Statistics agencies (offences), council DA portals (development applications). Population forecasts use a Hamilton-Perry cohort model calibrated to ABS ERP.
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