Ob Flat flood map & planning overlays
A planning-constraint profile of Ob Flat
(Southern Limestone Coast Council, SA) - 25.66 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 8 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
25.66 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Ob Flat's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Ob Flat at a glance
How Ob Flat is zoned
Selling in Ob Flat? 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 25.66 km², Ob Flat is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Rural Horticulture. The median lot measures about 18,944 m² across 336 parcels.
Who lives in Ob Flat
Census 2021 figures published by the ABS for the Ob Flat 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 1027, and decile 8 within South Australia. The national average is 1000.
Age profile
Share of Ob Flat's 470 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Grant, the wider ABS statistical area containing Ob Flat. There is no annual population series published at suburb level, so this describes the surrounding area rather than Ob Flat itself.
5,110 in 2001 to 6,505 in 2025, up 27%.
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.
Ob Flat 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 | Watched, not yet sampled here | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 8 September 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 Ob Flat 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.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Ob Flat lot.
See what's in the $9 report →Ob Flat planning - frequently asked
Is Ob Flat flood-prone?
Flood mapping covers Ob Flat and none of the suburb falls within a mapped flood overlay.
Is Ob Flat bushfire-prone?
Around 100% of Ob Flat is mapped as bushfire-prone, compared with a Southern Limestone Coast Council average of 98%.
What is the zoning in Ob Flat?
The dominant planning zone in Ob Flat is Rural Horticulture, though the suburb also includes Rural and Suburban Neighbourhood.
Does Ob Flat have heritage-listed places?
No heritage-listed places are on record within Ob Flat.
What is the typical lot size in Ob Flat?
Across 336 surveyed parcels in Ob Flat, the median lot size is about 18,944 m².
What is the population of Ob Flat?
At the 2021 Census Ob Flat had 470 usual residents, with a median age of 48 and an average household size of 2.6 people. The wider Grant statistical area, which contains Ob Flat, went from 5,110 people in 2001 to 6,505 in 2025, up 27%.
Is Ob Flat an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Ob Flat scores 1027 and sits in decile 8 of 10 nationally and decile 8 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Ob Flat?
Median household income in Ob Flat was $2,104 a week at the 2021 Census, against $1,833 for the typical suburb in Southern Limestone Coast Council. Median rent was $250 a week and the median mortgage repayment $1,625 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Square Mile | 2.5 km | 0% | 100% |
| Mount Gambier City of Mount Gambier |
6.2 km | 0% | 41% |
| Yahl | 6.2 km | 0% | 100% |
| Moorak | 8.1 km | 0% | 100% |
| Caveton | 9.3 km | 0% | 100% |
| Mount Schank | 9.6 km | 0% | 100% |
| Worrolong | 9.8 km | 0% | 98% |
| Suttontown | 11.0 km | 0% | 96% |
| Compton | 11.7 km | 0% | 100% |
| Caroline | 12.2 km | 0% | 100% |