Mortdale flood map & planning overlays
A planning-constraint profile of Mortdale
(Georges River, NSW) - 2.93 km², mapped from live council and
state overlay data. This suburb is moderately constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
2.93 km² - this suburb is moderately constrained by planning overlays.
Elevation hillshade with street names, clipped to Mortdale'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 Mortdale
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
typical observed square 4 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.
Mortdale at a glance
How Mortdale is zoned
Buying in Mortdale? 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 2.93 km², Mortdale is moderately constrained by planning overlays. About 8% of the suburb sits within a mapped flood overlay, and 10% is flagged bushfire-prone. There are 9 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 513 m² across 2,859 parcels.
Who lives in Mortdale
Census 2021 figures published by the ABS for the Mortdale 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 1061, and decile 9 within New South Wales. The national average is 1000.
Age profile
Share of Mortdale's 10,745 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Mortdale - Oatley, the wider ABS statistical area containing Mortdale. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mortdale itself.
13,212 in 2001 to 15,297 in 2025, up 16%.
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.
Mortdale 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 Mortdale 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 61% of Mortdale. 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 Mortdale lot.
See what's in the $9 report →Mortdale planning - frequently asked
Is Mortdale flood-prone?
About 8% of Mortdale falls within a mapped flood overlay, against the council-wide suburb average of 12%.
Is Mortdale bushfire-prone?
Around 10% of Mortdale is mapped as bushfire-prone, compared with a Georges River average of 7%.
Is Mortdale under a flight path?
Aircraft were observed below 3,000 ft over about 61% of Mortdale, and over about 100% 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 5,500 ft. At the busiest point in the suburb about 20 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 Mortdale?
The dominant planning zone in Mortdale is Low Density Residential, though the suburb also includes Public Recreation and General Industrial.
Does Mortdale have heritage-listed places?
Mortdale has 9 heritage-listed places on record.
What is the typical lot size in Mortdale?
Across 2,859 surveyed parcels in Mortdale, the median lot size is about 513 m². There are also 5 registered easements mapped in the suburb.
Does Mortdale have a train station?
Yes - Mortdale has 1 train station: Mortdale Station. It is also served by 71 bus stops.
What is the population of Mortdale?
At the 2021 Census Mortdale had 10,745 usual residents, with a median age of 38 and an average household size of 2.6 people. The wider Mortdale - Oatley statistical area, which contains Mortdale, went from 13,212 people in 2001 to 15,297 in 2025, up 16%.
Is Mortdale an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mortdale scores 1061 and sits in decile 9 of 10 nationally and decile 9 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Mortdale?
Median household income in Mortdale was $1,995 a week at the 2021 Census, against $2,050 for the typical suburb in Georges River. Median rent was $420 a week and the median mortgage repayment $2,286 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Penshurst | 1.5 km | 5% | 0% |
| Oatley | 1.6 km | 18% | 24% |
| Peakhurst | 1.7 km | 11% | 2% |
| Peakhurst Heights | 1.8 km | 14% | 22% |
| Hurstville Grove | 2.1 km | 9% | 14% |
| Narwee Canterbury-Bankstown |
2.5 km | 3% | 0% |
| Beverly Hills | 2.5 km | 14% | 0% |
| Connells Point | 2.7 km | 4% | 2% |
| Lugarno | 2.9 km | 27% | 49% |
| Hurstville | 2.9 km | 4% | 0% |