Seaforth (NSW), NSW
By Lauren McCaleb · Reviewed by Dylan Duncan ·
Seaforth sits on the northern shore of Sydney, a leafy residential pocket of the Northern Beaches that looks out across Middle Harbour toward Mosman, to which it is joined by the Spit Bridge. The suburb takes its name from Loch Seaforth and Seaforth Island in Scotland, and much of its land was held by Henry Halloran before he subdivided it in 1906. To the west the streets fall away to Sugarloaf Bay, with views over to Northbridge, Castlecrag and Castle Cove, while the bushland of Garigal National Park forms the northern boundary. A heritage-listed library, built in 1887, anchors the older part of the suburb, and a compact shopping district off Sydney Road serves the surrounding homes.
Among Australia's more advantaged suburbs
Seaforth (NSW) is more socio-economically advantaged than about 99% of the 14,462 Australian suburbs we score, based on the ABS SEIFA index (raw score 1181, where about 1000 is the national average).
A socio-economic measure from ABS Census data — not a measure of how good a suburb is to live in or visit. How we calculate this.
Is Seaforth (NSW) a good place to live?
There’s no single answer — it depends on what matters to you. So instead of one mystery number, we break it down: a transparent score on each part of life we can back with public data, and an honest “not yet” on the parts we can’t.
Strong on the data we score
A weighted blend of the 2 components we can score for Seaforth (NSW) from public data. It sits alongside — and reconciles with — the socio-economic Suburb Score above; it is a transparent read, not a complete verdict.
Socio-economic advantage
99/100Among Australia's more advantaged suburbs
Among Australia's more advantaged suburbs — the same ABS SEIFA-based Suburb Score (99/100) shown above. Income, education and occupation, as published by the ABS. · ABS SEIFA 2021
Housing affordability
1/100Among the more expensive suburbs
Median weekly rent was $875 at the 2021 Census — more affordable than about 1% of suburbs we can compare. Housing data only, no valuations. · ABS Census 2021
Not yet scored
We’d rather leave these open than publish a number we can’t stand behind. Here’s where each one stands.
- Amenities & accessNot scored yet — our OpenStreetMap amenity mapping is still rolling out across suburbs.
- Green spaceNot scored yet — our OpenStreetMap green-space mapping is still rolling out across suburbs.
- TransportNot scored yet — our OpenStreetMap public-transport mapping is still rolling out across suburbs.
- SchoolsNot scored yet — school performance (ACARA / ICSEA) needs a data-reuse licence cleared before we can publish it.
- SafetyNot scored yet — Australia has no single open crime dataset and safety data carries defamation and legal care, so it is gated pending a go/no-go and will be data-only when added.
- CommunityNot scored yet — we won't reduce community to a number from a proxy. We'd rather leave it open than publish an invented value judgement.
A transparent read on public data, not a verdict — and not a measure of any person or community. See our methodology for how each component is worked out and why some aren’t scored yet.
Seaforth (NSW) at a glance
- Population (2021)
- 7,384
- Median age
- 42
- Median weekly household income
- $4,184
- SEIFA score
- 1181
- Local government area
- Northern Beaches
- Coordinates
- -33.7946, 151.2431
Map of Seaforth (NSW)
© OpenStreetMap contributors · View larger map
Housing & property in Seaforth (NSW)
What it costs to live in Seaforth (NSW) and how residents hold their homes, from the Australian Bureau of Statistics 2021 Census.
- Median rent
- $875
- per week
- Median mortgage
- $4,333
- per month
- Owner-occupied
- 83%
- of dwellings
- Rented
- 16%
- of dwellings
The full tenure and dwelling-type breakdown is in the Seaforth (NSW) demographics section below.
Source: ABS Census of Population and Housing, 2021. © Australian Bureau of Statistics, released under CC BY 4.0. See our methodology.
Seaforth (NSW) demographics (2021 Census)
The figures below profile Seaforth (NSW) using the Australian Bureau of Statistics 2021 Census; every percentage is a share of a clearly stated Census count, so each one traces back to the source. At a glance, the largest age group is mid-life (45–64) at 31% and 33% of residents were born overseas.
Age profile
| Age group | People | Share |
|---|---|---|
| Children (0–14) | 1,711 | 23% |
| Youth (15–24) | 951 | 13% |
| Young adults (25–44) | 1,337 | 18% |
| Mid-life (45–64) | 2,262 | 31% |
| Seniors (65+) | 1,127 | 15% |
Share of the 7,388 people counted by age.
Housing and households
| Tenure | Dwellings | Share |
|---|---|---|
| Owned outright | 876 | 39% |
| Owned with a mortgage | 988 | 44% |
| Rented | 367 | 16% |
| Dwelling type | Dwellings | Share |
|---|---|---|
| Houses | 1,964 | 87% |
| Townhouses & semis | 182 | 8% |
| Flats & apartments | 116 | 5% |
Tenure and dwelling shares are of the roughly 2,265 occupied private dwellings in Seaforth (NSW).
- Average household size
- 3.1 people
- Median weekly family income
- $4,620
- Median weekly personal income
- $1,263
Community and culture
- Born overseas
- 2,393 (33%)
- Speaks a language other than English at home
- 1,106 (15%)
- Aboriginal and/or Torres Strait Islander
- 40 (1%)
Work and education
- Completed Year 12
- 4,272 (81%)
- Labour-force participation
- 63.5%
- Unemployment rate
- 3.3%
- Employed full-time
- 2,093
- Employed part-time
- 1,099
Source: ABS Census of Population and Housing, 2021 (General Community Profile, by Suburb and Locality). © Australian Bureau of Statistics, released under CC BY 4.0. How we group bands and derive each share is set out on our methodology page.
Weather and climate in Seaforth (NSW)
Based on 2014–2023 records, the warmest month in Seaforth (NSW) is January (average daytime high around 25.7°C) and the coolest is July (around 16.5°C). The area receives roughly 1084 mm of rain across the year.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 25.7°C | 19.3°C | 104 mm |
| Feb | 25.1°C | 19°C | 119 mm |
| Mar | 24°C | 18°C | 186 mm |
| Apr | 21.9°C | 15°C | 100 mm |
| May | 19.2°C | 11.7°C | 56 mm |
| Jun | 16.5°C | 9.8°C | 74 mm |
| Jul | 16.5°C | 8.7°C | 70 mm |
| Aug | 17.3°C | 9.2°C | 67 mm |
| Sep | 19.6°C | 11.3°C | 55 mm |
| Oct | 21.8°C | 13.7°C | 92 mm |
| Nov | 22.8°C | 15.5°C | 78 mm |
| Dec | 24.7°C | 17.5°C | 83 mm |
Climate normals, 2014–2023 (Open-Meteo, ERA5 reanalysis).
Share your local knowledge of Seaforth (NSW)
Lived here or spent time in Seaforth (NSW)? Add a review or a quick tip. Reviews and tips are moderated before they appear.
Common questions about Seaforth (NSW)
Is Seaforth (NSW) a good place to live?
There's no single answer, so we score what the public data can back. On socio-economic advantage and housing affordability, Seaforth (NSW) rates 66/100 overall (Strong on the data we score). Public transport, schools and safety aren't scored yet — see our methodology for why.
What is the median rent in Seaforth (NSW)?
At the 2021 Census, the median weekly rent in Seaforth (NSW) was $875, and the median monthly mortgage repayment was $4,333. These are official ABS Census figures — StreetScout publishes housing data only, with no property valuations or agent referrals.
Where is Seaforth (NSW)?
Seaforth (NSW) is a suburb of New South Wales, Australia, in the Northern Beaches local government area.
What is the population of Seaforth (NSW)?
At the 2021 Census, Seaforth (NSW) had a population of about 7,384.
Is Seaforth (NSW) an advantaged area?
Seaforth (NSW) has an ABS SEIFA score of 1181, where about 1000 is the national average — higher scores indicate greater relative socio-economic advantage. That gives it a Suburb Score of 99 out of 100 — more socio-economically advantaged than about 99% of Australian suburbs.
What is the weather like in Seaforth (NSW)?
Seaforth (NSW) has average daytime highs of about 21.3°C and overnight lows of about 14.1°C, with roughly 1,084 mm of rain across the year (based on 2014–2023 climate normals).
Does Seaforth (NSW) have high household incomes?
Seaforth (NSW) has one of the highest median weekly household incomes in New South Wales — the 6th-highest among suburbs with at least 1,000 residents at the 2021 Census ($4,184 per week).
Where Seaforth (NSW) ranks
Seaforth (NSW) appears in these data-driven guides — each a transparent sort on a single ABS figure shown on this page.
Nearby suburbs in New South Wales
More suburb guides in New South Wales
Other hand-written, cited guides — browse all guides.