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.
Seaforth (NSW) at a glance
- Population (2021)
- 7,384
- Median age
- 42
- Median weekly household income
- $4,184
- SEIFA score
- 1181
- Coordinates
- -33.7946, 151.2431
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%, 16% of homes are rented, 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).
- Median weekly rent
- $875
- Median monthly mortgage
- $4,333
- 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).
Common questions about Seaforth (NSW)
Where is Seaforth (NSW)?
Seaforth (NSW) is a suburb of New South Wales, Australia.
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 12th-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
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