Lock flood map & planning overlays
A planning-constraint profile of Lock
(District Council of Elliston, SA) - 637.3 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 4 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
637.3 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Lock's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Lock at a glance
How Lock is zoned
Selling in Lock? 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 637.3 km², Lock 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. The median lot measures about 32,560 m² across 351 parcels.
Who lives in Lock
Census 2021 figures published by the ABS for the Lock 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 973, and decile 5 within South Australia. The national average is 1000.
Age profile
Share of Lock's 253 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Le Hunte - Elliston, the wider ABS statistical area containing Lock. There is no annual population series published at suburb level, so this describes the surrounding area rather than Lock itself.
2,537 in 2001 to 2,207 in 2025, down 13%.
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.
Lock 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 4 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 Lock 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 Lock lot.
See what's in the $9 report →Lock planning - frequently asked
Is Lock flood-prone?
Flood mapping covers Lock and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 0%).
Is Lock bushfire-prone?
Around 100% of Lock is mapped as bushfire-prone, compared with a District Council of Elliston average of 99%.
What is the zoning in Lock?
The dominant planning zone in Lock is Rural, though the suburb also includes Employment (Bulk Handling) and Neighbourhood.
Does Lock have heritage-listed places?
No heritage-listed places are on record within Lock.
What is the typical lot size in Lock?
Across 351 surveyed parcels in Lock, the median lot size is about 32,560 m².
What is the population of Lock?
At the 2021 Census Lock had 253 usual residents, with a median age of 38 and an average household size of 2.2 people. The wider Le Hunte - Elliston statistical area, which contains Lock, went from 2,537 people in 2001 to 2,207 in 2025, down 13%.
Is Lock an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Lock scores 973 and sits in decile 5 of 10 nationally and decile 5 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Lock?
Median household income in Lock was $1,125 a week at the 2021 Census, against $1,125 for the typical suburb in District Council of Elliston. Median rent was $120 a week and the median mortgage repayment $512 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Murdinga | 16.1 km | 0% | 100% |
| Ulyerra | 20.0 km | 0% | 100% |
| Boonerdo The District Council of Cleve |
22.8 km | 0% | 100% |
| Polda | 24.8 km | 0% | 100% |
| Murlong The District Council of Cleve |
26.2 km | 0% | 100% |
| Hambidge The District Council of Cleve |
26.3 km | 0% | 100% |
| Tooligie | 29.5 km | 0% | 100% |
| Palkagee | 34.2 km | 0% | 100% |
| Hincks The District Council of Cleve |
36.5 km | 0% | 100% |
| Kappawanta | 38.5 km | 0% | 100% |