St Marys flood map & planning overlays

A planning-constraint profile of St Marys (City of Mitcham, SA) - 1.83 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 schematicSt Marys

Constraint readout

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

Flood overlay 29%

2.4× council avg (12%) · #3 of 29 mapped council suburbs

Bushfire-prone 41%

≈ council avg (53%) · #17 of 29 mapped council suburbs

Environmental0%

below council avg (4%) · #12 of 29 in council

Heritage sites 3 Noise corridor 2% Aircraft seen below 3,000 ft 99% Mostly Suburban Neighbourhood Flood 3rd most affected of 29 → Bushfire 17th most affected of 29 →

Elevation hillshade with street names, clipped to 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 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 3 Oct 2026

Under observed aircraft

99%

of the suburb, at or below 10,000 ft

Below 3,000 ft

99%

of the suburb's area

Lowest measured

500 ft

averaging 2,000 ft

Busiest square

~1 a day

1 a day below 3,000 ft · ±26% · area average
typical observed square 0 a day

Night movements: not established - night is sampled as often as day, but too few night flights have been seen here to conclude either way.

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.

St Marys at a glance

Parcels 1,823 Median lot 488 m² Bus stops 17

How St Marys is zoned

Suburban Neighbourhood 54%

Employment 16%

Conservation 12%

Recreation 10%

Strategic Employment 3%

General Neighbourhood 3%

Selling in St Marys? The zone and overlays on this page are the Planning and Design Code controls a Form 1 vendor's statement has to disclose.

Across its 1.83 km², St Marys is highly constrained by planning overlays. About 29% of the suburb sits within a mapped flood overlay, and 41% is flagged bushfire-prone. There are 3 heritage-listed sites on record, and the dominant land-use zone is Suburban Neighbourhood. The median lot measures about 488 m² across 1,823 parcels.

Who lives in St Marys

Census 2021 figures published by the ABS for the St Marys suburb boundary itself, not a wider region.

Population

3,010

usual residents, 2021

Median age

years

Median household income

$1,490

per week, City of Mitcham suburb typical $2,139

Median rent

$285

per week, City of Mitcham suburb typical $350

Median mortgage

$1,654

per month

Household size

2.4

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 6

most disadvantagedleast disadvantaged

Score 990, and decile 6 within South Australia. The national average is 1000.

Relative disadvantage (IRSD) Decile 5

most disadvantagedleast disadvantaged

Age profile

Share of St Marys's 3,010 residents in each ABS age band.

0-4 6.7%

5-14 9.8%

15-19 5.1%

20-24 6.6%

25-34 21.2%

35-44 16.1%

45-54 10.8%

55-64 10.7%

65-74 6.6%

75-84 4.7%

85+ 1.7%

Population trend, 2001 to 2025

Estimated resident population of Panorama, the wider ABS statistical area containing St Marys. There is no annual population series published at suburb level, so this describes the surrounding area rather than St Marys itself.

7,515 in 2001 to 9,097 in 2025, up 21%.

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.

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	the South Australian Planning and Design Code and Location SA spatial data
Bushfire-prone mapping	Mapped	the South Australian Planning and Design Code and Location SA spatial data
Zoning	Mapped	the South Australian Planning and Design Code and Location SA spatial data
Heritage and environment	Mapped where published	the South Australian Planning and Design Code and Location SA spatial data
Aircraft noise contours (ANEF)	Not held	the South Australian Planning and Design Code and Location SA spatial data, 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 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 99% of 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.

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

See what's in the $9 report →

St Marys planning - frequently asked

Is St Marys flood-prone?

About 29% of St Marys falls within a mapped flood overlay, against the council-wide suburb average of 12%.

Is St Marys bushfire-prone?

Around 41% of St Marys is mapped as bushfire-prone, compared with a City of Mitcham average of 53%.

Is St Marys under a flight path?

Aircraft were observed below 3,000 ft over about 99% of St Marys, in the period sampled (4 Sep 2026 to 3 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 1 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 St Marys?

The dominant planning zone in St Marys is Suburban Neighbourhood, though the suburb also includes Employment and Conservation.

Does St Marys have heritage-listed places?

St Marys has 3 heritage-listed places on record.

What is the typical lot size in St Marys?

Across 1,823 surveyed parcels in St Marys, the median lot size is about 488 m².

Does St Marys have a train station?

There is no train station inside St Marys itself. The suburb is served by 17 bus stops.

What is the population of St Marys?

At the 2021 Census St Marys had 3,010 usual residents, with a median age of 35 and an average household size of 2.4 people. The wider Panorama statistical area, which contains St Marys, went from 7,515 people in 2001 to 9,097 in 2025, up 21%.

Is St Marys an advantaged suburb?

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), St Marys scores 990 and sits in decile 6 of 10 nationally and decile 6 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).

What is the median household income in St Marys?

Median household income in St Marys was $1,490 a week at the 2021 Census, against $2,139 for the typical suburb in City of Mitcham. Median rent was $285 a week and the median mortgage repayment $1,654 a month.

Compare nearby suburbs

Nearby suburb	Distance	Flood mapped	Bushfire-prone
Pasadena	0.8 km	14%	39%
Clovelly Park City of Marion	1.0 km	0%	0%
Tonsley City of Marion	1.0 km	0%	56%
Panorama	1.6 km	16%	60%
Mitchell Park City of Marion	1.6 km	2%	4%
Melrose Park	2.1 km	30%	0%
Bedford Park	2.3 km	11%	98%
Eden Hills	2.4 km	6%	100%
Ascot Park City of Marion	2.4 km	0%	0%
Marion City of Marion	2.4 km	16%	0%

See all City of Mitcham suburb profiles →