Thornleigh at a glance
Walk score
34
Car dependent
Population
8,898
Median age 40
The brief
What to know about Thornleigh.
The postcode for Thornleigh is 2120 (NSW), part of Greater Sydney.
Thornleigh (2120) sits in the Hornsby region of NSW.
Thornleigh has roughly 8,898 residents, with a typical family-age mix. Households are predominantly owner-occupied. Daily life is car-friendly: most residents drive to work, school and the shops.
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What it’s like to live here.
Thornleigh scores 34/100 on walkability, which makes it car-friendly with limited public transport. Plan for two cars in a typical household, especially if work isn't local.
Summer days here average around 26°C (mild), winter mornings around 8°C (mild). Annual rainfall lands at about 1302mm. Data comes from the Bureau of Meteorology's Sydney (Observatory Hill) station, 32.5km away.
Schooling within or near the suburb covers 5 government primary, 3 government secondary, 3 Catholic, 8 independent.
Who lives here
Demographics.
The 2021 Census put Thornleigh's population at 8,898, with a median age of 40. That sits as a typical family-age mix. Households are predominantly owner-occupied (75% own, 23% rent), which shapes everything from school catchment stability to how often properties turn over. The household mix skews family-dominated (82% family households, 16% lone person), so amenity decisions tend to follow what families want: parks, schools, supermarkets.
Population
8,898
Median age
40
Family households
82%
Lone person
16%
Demographics data as of May 2026· ABS 2021 Census
Market
The price of a home here.
Median house price
Verified median pending
We don't yet have a verified suburb-level median for this market. We're working on a data partner; in the meantime, treat the state-level figures as a guide only. How we source data.
Sales data as of May 2026· rental-nsw
Rental and ownership
Weekly rent (house)
$520/wk
Weekly rent (unit)
$530/wk
Owner occupied
75%
Renter occupied
23%
At a deeper level
8,898
Median age: 40
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Safety
Crime and safety.
326
total offences in 2025
Top offence categories
Crime statistics are reported at LGA level and may cover a broader area than this suburb.
Source: State Police Open Data
Crime data as of January 2025· State Police Open Data
Getting around
Walkability.
34
0
45
Scores calculated from OpenStreetMap data (ODbL)
Walkability data as of May 2026· OpenStreetMap
Place
Location.
Amenities
Transport
Nearby suburbs
Education
Schools in Thornleigh.
Local schools for Thornleigh
View the catchment for each school to find out more.
Government School Catchment
Normanhurst West Public School
Thornleigh West Public School
Normanhurst Public School
© ACARA, licensed under CC BY 4.0.
Climate
Weather year-round.
Annual Rainfall
1302 mm
Hottest Month (avg max)
26.2°C
Coldest Month (avg min)
8.4°C
Monthly Rainfall (mm)
Weather data from BOM station Sydney (Observatory Hill) (33 km away)
Climate data as of May 2026· Bureau of Meteorology
Frequently asked
About Thornleigh.
- What is the Thornleigh postcode?
- Thornleigh is in the 2120 postcode, in NSW, in the Hornsby Shire Council region.
- Where is Thornleigh?
- Thornleigh is a suburb of Sydney, in NSW 2120. It is part of the Greater Sydney area, in the Hornsby Shire Council region.
- What is the average rent in Thornleigh?
- The median weekly rent for houses is $520, for units it's $530.
- What schools are in Thornleigh?
- There are 20 schools serving Thornleigh on this page, including Normanhurst West Public School, Thornleigh West Public School, Normanhurst Public School.
- How walkable is Thornleigh?
- Thornleigh has a Walk Score of 34 out of 100, car-dependent for most errands. transit score 0, bike score 45.
- What suburbs are near Thornleigh?
- Thornleigh is close to Normanhurst, Westleigh, Pennant Hills, Wahroonga, Hornsby.
- What is the population of Thornleigh?
- The population of Thornleigh is approximately 8,898 (2021 Census). The median age is 40.
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Sources cited
Median, growth and rental data from state revenue offices and ABS. Census from ABS 2021. Climate from BoM. Hazard from Geoscience Australia. School data from ACARA. Crime from state police open data. Full methodology →
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