North St Marys flood map & planning overlays
A planning-constraint profile of North St Marys (Penrith, NSW) - 3.19 km², mapped from live council and state overlay data. This suburb is highly constrained.
Everything below is suburb-wide. Overlays change block to block - see which ones actually touch your lot. The map is free.
Constraint readout
3.19 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to North St Marys's boundary, with the flood, bushfire and environmental overlays drawn on top. It shows where constraints fall; the interactive map shows them on your exact address.
North St Marys at a glance
How North St Marys is zoned
Buying in North St Marys? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 3.19 km², North St Marys is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 38% is flagged bushfire-prone. There are 3 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 695 m² across 1,493 parcels. These figures are suburb-wide - the overlays that actually apply to a given lot can differ block to block, which is what a property-level check tells you.
Who lives in North St Marys
Census 2021 figures published by the ABS for the North St Marys suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 847, and decile 1 within New South Wales. The national average is 1000.
Age profile
Share of North St Marys's 4,123 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of St Marys - North St Marys, the wider ABS statistical area containing North St Marys. There is no annual population series published at suburb level, so this describes the surrounding area rather than North St Marys itself.
13,398 in 2001 to 18,757 in 2025, up 40%.
Source: Australian Bureau of Statistics. Census of Population and Housing 2021 (General Community Profile) and SEIFA 2021, both published at the Suburbs and Localities level; Regional Population (estimated resident population) at Statistical Area Level 2. Used under CC BY 4.0. Census counts of small populations are randomly adjusted by the ABS to protect confidentiality, so figures for small suburbs are indicative.
North St Marys data sources and coverage
Every figure below is an aggregate for the suburb boundary. “Not mapped” means LayeredGeo does not hold a source layer covering this suburb; it is never an all-clear for a particular property.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 5 August 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.
Check a specific North St Marys address
See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.
See what's in the $9 report →North St Marys planning - frequently asked
Where can I see a flood map of North St Marys?
The schematic on this page is a North St Marys flood map: the mapped flood overlays drawn over the suburb's terrain and street grid. Flood lines vary block to block, so for a specific property use the free interactive map - search any North St Marys address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is North St Marys flood-prone?
Flood mapping covers North St Marys and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 0%). Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.
Is North St Marys bushfire-prone?
Yes - around 38% of North St Marys is mapped as bushfire-prone, compared with a Penrith average of 42%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in North St Marys?
The dominant planning zone in North St Marys is Low Density Residential, though the suburb also includes Environmental Conservation and General Industrial. Zoning sets what you can build and do on a site, and can differ lot by lot.
Does North St Marys have heritage-listed places?
North St Marys has 3 heritage-listed places on record. Heritage listing affects what you can alter or demolish, so confirm whether a specific property is listed or near a heritage place.
What is the typical lot size in North St Marys?
Across 1,493 surveyed parcels in North St Marys, the median lot size is about 695 m². There are also 4 registered easements mapped in the suburb - an easement can restrict where you can build, so always check the title and overlays for the specific lot.
Does North St Marys have a train station?
Yes - North St Marys has 1 train station: St Marys Station. It is also served by 80 bus stops.
What is the population of North St Marys?
At the 2021 Census North St Marys had 4,123 usual residents, with a median age of 35 and an average household size of 2.7 people. The wider St Marys - North St Marys statistical area, which contains North St Marys, went from 13,398 people in 2001 to 18,757 in 2025, up 40%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than North St Marys alone.
Is North St Marys an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), North St Marys scores 847 and sits in decile 1 of 10 nationally and decile 1 within New South Wales - decile 1 being the most disadvantaged tenth of Australian suburbs and decile 10 the least. The national average score is 1000. SEIFA summarises income, education, occupation and housing across the whole suburb, so it describes the area, not any particular household in it.
What is the median household income in North St Marys?
Median household income in North St Marys was $1,255 a week at the 2021 Census, against $2,067 for the typical suburb in Penrith. Median rent was $340 a week and the median mortgage repayment $1,800 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a North St Marys property?
A North St Marys planning report pulls every overlay - zoning, flood, bushfire, heritage and environmental - that touches a single lot, on live council and state data. The interactive map preview is free; a full PDF report is $9.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Tregear Blacktown |
1.2 km | 0% | 21% |
| St Marys | 1.3 km | <1% | 26% |
| Whalan Blacktown |
1.8 km | 0% | 7% |
| Oxley Park | 2.1 km | 0% | 23% |
| Lethbridge Park Blacktown |
2.2 km | 0% | 1% |
| Emerton Blacktown |
2.4 km | 0% | 0% |
| Ropes Crossing Blacktown |
2.7 km | 0% | 78% |
| Dharruk Blacktown |
2.9 km | 0% | 0% |
| Mount Druitt Blacktown |
3.2 km | 0% | 16% |
| Werrington | 3.2 km | 0% | 25% |