Castlecrag

NSW

Castlecrag is a declining suburb in NSW with 2,965 residents.

SAL code: 10848
SA2: 121011683
Population: 2,965
LGA: Willoughby

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Castlecrag suburb boundary

Castlecrag, NSW had 2,965 residents at the 2021 Census, with the broader statistical area showing a 1.0% decline over the last five years. The predominant age group is 45-54 years, and the median age sits at 47. Households are most often couples with children, and those with a mortgage repay a median of $4,333 a month. Around 88.9% of homes are owner-occupied, with the largest single tenure being owned outright at 49.6%. Most dwellings are separate houses, making up 97.2% of the suburb's housing stock. The suburb has 9 parks and reserves mapped within its boundary. Source: ABS Census 2021 and Estimated Resident Population, with amenity counts from state Open Data and OpenStreetMap.

Population

2,965

Suburb · Census 2021

5-Year Growth

-1.0%

3yr: +1.8% · 10yr: -1.2%

SA2 · 5yr

Household Income

$4,675/wk

Suburb · Census 2021 median

Median Age

Suburb · Census 2021

Socio-Economic Index

10/10

SA2 · least disadvantaged

Unemployment

2.8%

SA4 · Q4 2025

Hospitals

Not available

No data for this suburb

Childcare services

1 long day, 1 OSHC

Parks & green space

Parks, reserves

Transport stops

GTFS stops

Dwelling approvals

Willoughby · Feb 2026

Median Weekly Rent

$850/wk+6.3% YoY2026 Q1

Postcode-level

Based on NSW rental bond lodgements, aggregated at postcode level. All SALs sharing this postcode show the same median.

Median House Sale Price

$4,650,000+1.5% YoY2025 Q4

House only

Source: state Valuer-General (suburb-level quarterly medians).

→ Calculate stamp duty on this suburb's median price → Estimate mortgage repayments → Calculate rental yield (price + median rent)

Safety & Crime

2025 Q4

3.4

per 1,000 residents

↓ 29%

vs prior year

Theft

6 offences

Reported incidents from NSW police. Offence rates may not reflect all crime.

Population over time — Castle Cove - Northbridge (SA2)

ABS publishes annual estimates only at SA2; Castlecrag suburb alone is ~2,965 (Census 2021).

Growth at a Glance

3yr: +1.8%5yr: -1.0%10yr: -1.2%Total: +7.7%

Population grew from 12,615 to 13,592 over 24 years, averaging 0.3% per year.

Government school catchment

Intake zone

Primary

Willoughby PS90.9%

Castle Cove PS 9.1%
Northbridge PS 0.0%

Secondary

Willoughby GHS100.0%

Cammeraygal HS 90.8%
Mosman HS 90.8%
Killarney Hts HS 9.1%
Chatswood HS 0.1%

Source: NSW Department of Education — School Intake Zones. Boundaries can be amended without notice; confirm with the school before relying on enrolment.

Profile

Census snapshot

ABS · 2021

Housing

Almost entirely detached houses (97.2%), owner-occupied (89%), built for families (45% are 4 bed).

Dwelling mix

Houses 97%

930 houses17 townhouses10 apartments

Tenure

Owned 50%

Mortgage 39%

Number of bedrooms

1 bed

16 (1.7%)

2 bed

62 (6.5%)

3 bed

270 (28.3%)

4 bed

434 (45.4%)

5 bed

160 (16.8%)

6+ bed

13 (1.4%)

Bushfire & flood risk

Hazard data is not yet available for NSW.

Source when available: NSW Rural Fire Service (BFPL) and NSW DPHI EPI Flood.

Planning zones

7 zones in suburb

Code	Zone	% covered	Area
C4	ZoneEnvironmental	53.1%	0.80 km²
C2	ZoneEnvironmental	23.9%	0.36 km²
R2	ZoneResidential	14.9%	0.22 km²
RE1	ZoneRecreation	2.5%	0.04 km²
SP2	ZoneSpecial use	1.4%	0.02 km²
E1	ZoneEnvironmental	1.1%	0.02 km²
R3	ZoneResidential	0.2%	3,304 m²

Source: NSW DPHI EPI Land Zoning (ZONE_NSW/2026-04-29/1eccf1a530fa1be5) · As of Apr 2026. Zone boundaries are amended periodically; verify the exact property with the relevant council before relying on permitted use.