Mullion flood map & planning overlays
A planning-constraint profile of Mullion
(Yass Valley, NSW) - 148.91 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.
Constraint readout
148.91 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Mullion'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 Mullion
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 1 a day
Night movements: observed, lowest 7,500 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.
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.
Mullion at a glance
How Mullion is zoned
Buying in Mullion? 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 148.91 km², Mullion 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 Primary Production. The median lot measures about 245,727 m² across 282 parcels.
Who lives in Mullion
Census 2021 figures published by the ABS for the Mullion 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 1047, and decile 8 within New South Wales. The national average is 1000.
Age profile
Share of Mullion's 89 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Yass Surrounds, the wider ABS statistical area containing Mullion. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mullion itself.
8,258 in 2001 to 13,346 in 2025, up 62%.
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.
Mullion 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 Mullion 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 10% of Mullion. 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 Mullion lot.
See what's in the $9 report →Mullion planning - frequently asked
Is Mullion flood-prone?
Flood mapping covers Mullion and none of the suburb falls within a mapped flood overlay.
Is Mullion bushfire-prone?
Around 100% of Mullion is mapped as bushfire-prone, compared with a Yass Valley average of 99%.
Is Mullion under a flight path?
Aircraft were observed below 3,000 ft over about 10% of Mullion, and over about 40% 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 2,000 ft, with an average of 4,000 ft. At the busiest point in the suburb about 4 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 Mullion?
The dominant planning zone in Mullion is Primary Production, though the suburb also includes Natural Waterways and National Parks and Nature Reserves.
Does Mullion have heritage-listed places?
No heritage-listed places are on record within Mullion.
What is the typical lot size in Mullion?
Across 282 surveyed parcels in Mullion, the median lot size is about 245,727 m². There are also 16 registered easements mapped in the suburb.
What is the population of Mullion?
At the 2021 Census Mullion had 89 usual residents, with a median age of 55 and an average household size of 2.6 people. The wider Yass Surrounds statistical area, which contains Mullion, went from 8,258 people in 2001 to 13,346 in 2025, up 62%.
Is Mullion an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mullion scores 1047 and sits in decile 9 of 10 nationally and decile 8 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Mullion?
Median household income in Mullion was $2,437 a week at the 2021 Census, against $2,625 for the typical suburb in Yass Valley. Median rent was $581 a week and the median mortgage repayment $2,500 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Wallaroo | 12.4 km | <1% | 100% |
| Jeir | 13.0 km | 0% | 100% |
| Uriarra | 15.3 km | 0% | 100% |
| Cavan | 16.3 km | 0% | 97% |
| Boambolo | 17.8 km | 0% | 99% |
| Wee Jasper | 18.2 km | 0% | 99% |
| Narrangullen | 20.1 km | 0% | 95% |
| Springrange | 20.5 km | 0% | 100% |
| Murrumbateman | 23.9 km | 0% | 99% |
| Good Hope | 27.1 km | 0% | 93% |