Mount Saint Thomas flood map & planning overlays
A planning-constraint profile of Mount Saint Thomas (Wollongong, NSW) - 0.55 km², mapped from live council and state overlay data. This suburb is moderately constrained.
Everything below is suburb-wide. Overlays change block to block - see which ones actually touch your lot. The map is free.
Constraint readout
0.55 km² - this suburb is moderately constrained by planning overlays.
Elevation hillshade with street names, clipped to Mount Saint Thomas'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.
Mount Saint Thomas at a glance
How Mount Saint Thomas is zoned
Buying in Mount Saint Thomas? 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 0.55 km², Mount Saint Thomas is moderately constrained by planning overlays. About 18% of the suburb sits within a mapped flood overlay, and 15% is flagged bushfire-prone. There is 1 heritage-listed site on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 550 m² across 591 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 Mount Saint Thomas
Census 2021 figures published by the ABS for the Mount Saint Thomas 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 1006, and decile 6 within New South Wales. The national average is 1000.
Age profile
Share of Mount Saint Thomas's 1,449 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Wollongong - West, the wider ABS statistical area containing Mount Saint Thomas. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mount Saint Thomas itself.
14,827 in 2001 to 17,595 in 2025, up 19%.
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.
Mount Saint Thomas 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 Mount Saint Thomas 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 →Mount Saint Thomas planning - frequently asked
Where can I see a flood map of Mount Saint Thomas?
The schematic on this page is a Mount Saint Thomas flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 18% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Mount Saint Thomas address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is Mount Saint Thomas flood-prone?
About 18% of Mount Saint Thomas falls within a mapped flood overlay, against the council-wide suburb average of 4%. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.
Is Mount Saint Thomas bushfire-prone?
Yes - around 15% of Mount Saint Thomas is mapped as bushfire-prone, compared with a Wollongong average of 56%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in Mount Saint Thomas?
The dominant planning zone in Mount Saint Thomas is Low Density Residential, though the suburb also includes Infrastructure and Public Recreation. Zoning sets what you can build and do on a site, and can differ lot by lot.
Does Mount Saint Thomas have heritage-listed places?
Mount Saint Thomas has 1 heritage-listed place 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 Mount Saint Thomas?
Across 591 surveyed parcels in Mount Saint Thomas, the median lot size is about 550 m².
Does Mount Saint Thomas have a train station?
There is no train station inside Mount Saint Thomas itself. The suburb is served by 23 bus stops.
What is the population of Mount Saint Thomas?
At the 2021 Census Mount Saint Thomas had 1,449 usual residents, with a median age of 37 and an average household size of 2.6 people. The wider Wollongong - West statistical area, which contains Mount Saint Thomas, went from 14,827 people in 2001 to 17,595 in 2025, up 19%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Mount Saint Thomas alone.
Is Mount Saint Thomas an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mount Saint Thomas scores 1006 and sits in decile 7 of 10 nationally and decile 6 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 Mount Saint Thomas?
Median household income in Mount Saint Thomas was $1,835 a week at the 2021 Census, against $1,912 for the typical suburb in Wollongong. Median rent was $300 a week and the median mortgage repayment $2,167 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a Mount Saint Thomas property?
A Mount Saint Thomas 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 |
|---|---|---|---|
| Mangerton | 0.9 km | 9% | 23% |
| Coniston | 1.1 km | 42% | 10% |
| Spring Hill | 1.5 km | 10% | 0% |
| West Wollongong | 1.6 km | <1% | 4% |
| Wollongong | 2.3 km | 29% | <1% |
| Figtree | 2.5 km | 0% | 38% |
| Unanderra | 2.9 km | 0% | 17% |
| Gwynneville | 3.1 km | 0% | 7% |
| Keiraville | 3.4 km | 0% | 25% |
| Cringila | 3.4 km | 0% | 59% |