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.
Profile updated 3 October 2026.

Suburb-wide figures; the free map shows which overlays touch your lot.

Planning schematicNorth St Marys

Constraint readout

3.19 km² - this suburb is highly constrained by planning overlays.

Flood overlay 0%

below council avg (12%) · #22 of 33 mapped council suburbs

Modelled flood depth held over parts of North St Marys

Bushfire-prone 38%

≈ council avg (42%) · #14 of 33 mapped council suburbs

Environmental19%

1.6× council avg (12%) · #5 of 33 in council

Heritage sites 3 Aircraft seen below 3,000 ft 91% Mostly Low Density Residential Bushfire 14th most affected of 33 →

Elevation hillshade with street names, clipped to North St Marys's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.

Nearby suburbs, nearest first

Aircraft noise and flight paths over North St Marys

Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.

Observed overflight - sampled 4 Sep to 2 Oct 2026

Under observed aircraft

92%

of the suburb, at or below 10,000 ft

Below 3,000 ft

91%

of the suburb's area

Lowest measured

500 ft

averaging 2,000 ft

Busiest square

~5 a day

5 a day below 3,000 ft · ±28%
typical observed square 2 a day

Night movements: observed, lowest 6,500 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.

Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.

North St Marys at a glance

Parcels 1,493 Median lot 695 m² Mapped easements 4 Train St Marys Station Bus stops 80

How North St Marys is zoned

Low Density Residential 42%

Environmental Conservation 19%

General Industrial 16%

Public Recreation 11%

Private Recreation 6%

Infrastructure 4%

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.

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.

Population

4,123

usual residents, 2021

Median age

years

Median household income

$1,255

per week, Penrith suburb typical $2,067

Median rent

$340

per week, Penrith suburb typical $428

Median mortgage

$1,800

per month

Household size

2.7

people, average

Socio-economic standing

ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.

Advantage and disadvantage (IRSAD) Decile 1

most disadvantagedleast disadvantaged

Score 847, and decile 1 within New South Wales. The national average is 1000.

Relative disadvantage (IRSD) Decile 1

most disadvantagedleast disadvantaged

Age profile

Share of North St Marys's 4,123 residents in each ABS age band.

0-4 6.7%

5-14 14.7%

15-19 6.7%

20-24 7.3%

25-34 14.5%

35-44 11.7%

45-54 11.9%

55-64 10.8%

65-74 7.3%

75-84 5.1%

85+ 3.4%

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: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.

North St Marys data sources and coverage

“Not mapped” means we hold no source layer for this suburb - never an all-clear.

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
Aircraft noise contours (ANEF)	Not held	NSW Government spatial services, NSW ePlanning and published council flood studies, Defence
Observed flight paths	Observed	adsb.lol, under the Open Database License
Demographics	Available	Australian Bureau of Statistics (2021 Census and SEIFA)

Profile last materially updated 3 October 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.

Aircraft have been seen below 3,000 ft over about 91% of North St Marys. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.

Published flood models are held over parts of North St Marys. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.

Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a North St Marys lot.

See what's in the $9 report →

North St Marys planning - frequently asked

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 12%). Published flood models are held over parts of North St Marys; the free check on the Flood Model Report page says whether one reaches a given address.

Is North St Marys bushfire-prone?

Around 38% of North St Marys is mapped as bushfire-prone, compared with a Penrith average of 42%.

Is North St Marys under a flight path?

Aircraft were observed below 3,000 ft over about 91% of North St Marys, and over about 92% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 2 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 2,000 ft. At the busiest point in the suburb about 5 aircraft a day were recorded passing over one 500 m square. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.

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.

Does North St Marys have heritage-listed places?

North St Marys has 3 heritage-listed places on record.

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.

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%.

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 is the most disadvantaged tenth, decile 10 the least).

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.

Compare nearby suburbs

Nearby suburb	Distance	Flood mapped	Bushfire-prone
Tregear Blacktown	1.2 km	13%	21%
St Marys	1.3 km	10%	26%
Whalan Blacktown	1.8 km	11%	7%
Oxley Park	2.1 km	0%	23%
Lethbridge Park Blacktown	2.2 km	8%	1%
Emerton Blacktown	2.4 km	10%	0%
Ropes Crossing Blacktown	2.7 km	11%	78%
Dharruk Blacktown	2.9 km	9%	0%
Mount Druitt Blacktown	3.2 km	13%	16%
Werrington	3.2 km	<1%	25%

See all Penrith suburb profiles →