Jilliby flood map & planning overlays
A planning-constraint profile of Jilliby
(Central Coast, NSW) - 83.16 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
83.16 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Jilliby'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 Jilliby
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 2,500 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.
Jilliby at a glance
How Jilliby is zoned
Buying in Jilliby? 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 83.16 km², Jilliby is highly constrained by planning overlays. About 14% of the suburb sits within a mapped flood overlay, and 92% is flagged bushfire-prone. There are 7 heritage-listed sites on record, and the dominant land-use zone is National Parks and Nature Reserves. The median lot measures about 10,631 m² across 662 parcels.
Who lives in Jilliby
Census 2021 figures published by the ABS for the Jilliby 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 1050, and decile 8 within New South Wales. The national average is 1000.
Age profile
Share of Jilliby's 1,694 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Jilliby - Yarramalong, the wider ABS statistical area containing Jilliby. There is no annual population series published at suburb level, so this describes the surrounding area rather than Jilliby itself.
3,011 in 2001 to 3,627 in 2025, up 20%.
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.
Jilliby 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 Jilliby 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 20% of Jilliby. 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 Jilliby lot.
See what's in the $9 report →Jilliby planning - frequently asked
Is Jilliby flood-prone?
About 14% of Jilliby falls within a mapped flood overlay, against the council-wide suburb average of 30%.
Is Jilliby bushfire-prone?
Around 92% of Jilliby is mapped as bushfire-prone, compared with a Central Coast average of 69%.
Is Jilliby under a flight path?
Aircraft were observed below 3,000 ft over about 20% of Jilliby, and over about 52% 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 3,500 ft. At the busiest point in the suburb about 1 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 Jilliby?
The dominant planning zone in Jilliby is National Parks and Nature Reserves, though the suburb also includes Primary Production and Forestry.
Does Jilliby have heritage-listed places?
Jilliby has 7 heritage-listed places on record.
What is the typical lot size in Jilliby?
Across 662 surveyed parcels in Jilliby, the median lot size is about 10,631 m². There are also 11 registered easements mapped in the suburb.
Does Jilliby have a train station?
There is no train station inside Jilliby itself. The suburb is served by 150 bus stops.
What is the population of Jilliby?
At the 2021 Census Jilliby had 1,694 usual residents, with a median age of 43 and an average household size of 3.4 people. The wider Jilliby - Yarramalong statistical area, which contains Jilliby, went from 3,011 people in 2001 to 3,627 in 2025, up 20%.
Is Jilliby an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Jilliby scores 1050 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 Jilliby?
Median household income in Jilliby was $2,713 a week at the 2021 Census, against $1,735 for the typical suburb in Central Coast. Median rent was $445 a week and the median mortgage repayment $2,564 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Little Jilliby | 2.2 km | 29% | 86% |
| Durren Durren | 4.1 km | 4% | 100% |
| Dooralong | 4.6 km | 23% | 87% |
| Alison | 6.0 km | 44% | 53% |
| Halloran | 6.0 km | 39% | 99% |
| Warnervale | 6.4 km | 58% | 96% |
| Kiar | 6.6 km | 4% | 100% |
| Wyong Creek | 7.1 km | 33% | 83% |
| Watanobbi | 7.5 km | 18% | 50% |
| Wallarah | 8.0 km | 9% | 98% |