Gillen at a glance
Population
20.3k
Median age 34
The brief
What to know about Gillen.
The postcode for Gillen is 0870 (SA).
Gillen (0870) sits in the South Australia region of South Australia.
Gillen has roughly 20,341 residents, with a young-family demographic. Households are dominated by renters.
Who lives here
Demographics.
The 2021 Census put Gillen's population at 20,341, with a median age of 34. That sits as a young-family demographic.
Population
20,341
Median age
34
Family households
–
Lone person
–
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.
Rental and ownership
Weekly rent (house)
$390/wk
Weekly rent (unit)
$332/wk
Owner occupied
–
Renter occupied
–
At a deeper level
20,341
Median age: 34
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Safety
Crime and safety.
1
total offences in 2025-26
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 June 2026· State Police Open Data
Place
Location.
Amenities
Transport
Nearby suburbs
Education
Schools in Gillen.
Frequently asked
About Gillen.
- What is the Gillen postcode?
- Gillen is in the 0870 postcode, in SA, in the South Australia region.
- Where is Gillen?
- Gillen is a regional suburb in SA, postcode 0870, in the South Australia region.
- What is the average rent in Gillen?
- The median weekly rent for houses is $390, for units it's $332.
- What is the population of Gillen?
- The population of Gillen is approximately 20,341 (2021 Census). The median age is 34.
For Sale
Gillen
Buying
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 →
Always dated
Every figure on this page carries its source and as-of date in a tooltip. If a figure looks off to you, tell us and we’ll fix it within a week.
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