Cassini vs Seddon

Seddon is the younger of the two, with a median age of 37 against 41 in Cassini. In both, the large majority of households own their home and the large majority of homes are detached houses. In Cassini, about half of households are people living alone. In Seddon, most households are couple families. On these figures, Cassini tends to suit people living alone, families with children, and older residents, while Seddon suits young adults.

Which one suits you?

There is no overall winner — the suburb that suits a family with school-age kids is routinely the wrong one for someone commuting into the city. So each of these answers its own question, against a checklist you can see, using the same figures in the tables below.

Families with school-age kids

Seddon

ahead on 2 of the 6 things we measure here

  • carries lower crime risk (16/100 vs 55/100)
  • is already more of a family suburb (79% vs 54%)
  • But Cassini has more parks and reserves (15 vs 10)

Weighs schools, house stock, crime, parks, childcare, and who already lives there.

First-home buyers

Too close to call

Nothing among the 1 things we measure here separates them by enough to be worth acting on.

Weighs mortgage stress.

Renters

Cassini

ahead on the one thing that separates them

  • has cheaper rent ($100/wk vs $125/wk)

Weighs rent and rental stress.

Commuting to the city

Cassini

ahead on 2 of the 3 things we measure here

  • has a shorter drive in (220 min vs 239 min)
  • sits closer to the CBD (206.5 km vs 218.3 km)

Weighs distance, drive time, and walkability.

Downsizers and retirees

They split

one each way, out of the 4 things we measure here

  • Cassini has more residents already 65 and over (25% vs 14%)
  • Seddon carries lower crime risk (16/100 vs 55/100)

Weighs who already lives there, GPs, walkability, and crime.

Investors

Seddon

ahead on the one thing that separates them

  • is growing faster (4.9% vs -9.9%)

Weighs population growth.

Where they sit

Cassini and Seddon drawn to the same scale. Both outlines are shown together, so the map answers whether they share a border and how their areas compare.

Cassini Seddon
Hides rows where both suburbs match

Bars start at zero. Scores, risks and rankings are drawn against their full 0–100 range; other rows are drawn in proportion to the larger of the two.

Side by side, out of 100

Risks are inverted — shown as safety and low exposure — so a longer bar always means better.

Cassini Seddon
Walkability 0 / 0
Cassini — Walkability: 0/100 Seddon — Walkability: 0/100
Safety 45 / 84
Cassini — Safety: 45/100 Seddon — Safety: 84/100
Low fire risk 22 / 20
Cassini — Low fire risk: 22/100 Seddon — Low fire risk: 20/100

Demographics

Seddon has more residents (107 vs 73); Seddon rents higher ($125/wk vs $100/wk).

Cassini Seddon
Population 73 107
+47% vs other
Population trend (2016 → 2021) -9.9% +4.9%
Median age 41 37
Median household income $80,184/yr $88,816/yr
+11% vs other
Median weekly rent $100/wk $125/wk
+25% vs other

Age profile

Share of residents in each band, 2021 Census.

Cassini Seddon
0-4 4.1% / 5.6%
Cassini — 0-4: 4.1% Seddon — 0-4: 5.6%
5-14 21.9% / 12.1%
Cassini — 5-14: 21.9% Seddon — 5-14: 12.1%
15-19 — / 6.5%
Cassini — 15-19: not among its largest Seddon — 15-19: 6.5%
20-24 — / 11.2%
Cassini — 20-24: not among its largest Seddon — 20-24: 11.2%
25-34 6.8% / 14.0%
Cassini — 25-34: 6.8% Seddon — 25-34: 14.0%
35-44 17.8% / 13.1%
Cassini — 35-44: 17.8% Seddon — 35-44: 13.1%
45-54 12.3% / 9.3%
Cassini — 45-54: 12.3% Seddon — 45-54: 9.3%
55-64 9.6% / 8.4%
Cassini — 55-64: 9.6% Seddon — 55-64: 8.4%
65-74 20.5% / 14.0%
Cassini — 65-74: 20.5% Seddon — 65-74: 14.0%
75-84 4.1% / —
Cassini — 75-84: 4.1% Seddon — 75-84: not among its largest
85+ — / —
Cassini — 85+: not among its largest Seddon — 85+: not among its largest

Bars are drawn against the largest share shown (21.9%).

Where residents were born

Largest overseas birthplaces, as a share of all residents, 2021 Census. A dash means that country is not among the suburb's own eight largest.

Cassini Seddon
England 6.8% / —
Cassini — England: 6.8% Seddon — England: not among its largest
Philippines — / 3.7%
Cassini — Philippines: not among its largest Seddon — Philippines: 3.7%

Bars are drawn against the largest share shown (6.8%).

Who lives together

Household composition, 2021 Census.

Cassini 54.5% couple families
Cassini — Couple Families: 54.5% Cassini — Lone Person: 45.5% Cassini — One Parent Families: 0.0%
Seddon 62.5% couple families
Seddon — Couple Families: 62.5% Seddon — Lone Person: 20.8% Seddon — One Parent Families: 16.7%
Couple Families Lone Person One Parent Families

What people live in

Occupied private dwellings by structure, 2021 Census.

Cassini 100.0% houses
Cassini — Houses: 100.0%
Seddon 100.0% houses
Seddon — Houses: 100.0%
Houses

Qualifications

Highest non-school qualification, residents 15+, 2021 Census.

Cassini Seddon
Certificate III & IV 21.9% / 11.2%
Cassini — Certificate III & IV: 21.9% Seddon — Certificate III & IV: 11.2%
Bachelor Degree 9.6% / 17.8%
Cassini — Bachelor Degree: 9.6% Seddon — Bachelor Degree: 17.8%
Advanced Diploma / Diploma 8.2% / 2.8%
Cassini — Advanced Diploma / Diploma: 8.2% Seddon — Advanced Diploma / Diploma: 2.8%
Postgraduate Degree 4.1% / 4.7%
Cassini — Postgraduate Degree: 4.1% Seddon — Postgraduate Degree: 4.7%

Bars are drawn against the largest share shown (21.9%).

Who owns and who rents

Occupied private dwellings by tenure, 2021 Census.

Cassini 0.0% renting
Cassini — Owned Outright: 56.2% Cassini — Mortgage: 43.8% Cassini — Renting: 0.0%
Seddon 25.0% renting
Seddon — Owned Outright: 53.1% Seddon — Mortgage: 21.9% Seddon — Renting: 25.0%
Owned outright Mortgage Renting

Zoning mix

Cassini has more land zoned for conservation (13% vs 0%); Seddon has more rural and farming land (100% vs 87%).

Cassini Seddon
Rural and farming 87% 100%
Environmental 13% 0%
Zoning sets what may be built, not what is there today. A single address can sit in a different zone to the suburb around it. Zones as at 2026-09.

Development activity

Cassini Seddon
New dwellings approved 48
across Kangaroo Island
same for both
Approvals change year on year -12%
same for both

Ranking within SA

Cassini Seddon
House price —
same for both
Income Higher than 55% of SA Higher than 68% of SA
Schools —
same for both
Walkability Higher than 41% of SA Higher than 24% of SA
Affordability —
same for both
EV adoption Higher than 46% of SA Higher than 45% of SA
NBN connectivity Higher than 27% of SA Higher than 11% of SA

Liveability

Cassini Seddon
Grade —
same for both
Score —
same for both
Socio-economic band advantaged area
decile 8/10
 mid-range socio-economic
decile 6/10

Risk profile

Cassini carries more crime risk (55 vs 16).

Cassini Seddon
Bushfire High
78/100
 High
80/100
Crime Moderate
55/100
 Low
16/100
Flood —
same for both
Coastal erosion Moderate
41/100
 None
0/100
Aircraft noise None
0/100
same for both
Industrial facilities nearby 0
within 5 km
same for both

Schools

Cassini Seddon
Inside the suburb 0
same for both
Rated above peers 0
same for both
Rated at peers 0
same for both
Rated below peers 0
same for both

Amenities in the suburb

Cassini Seddon
Cafes & restaurants 1
same for both
Parks & reserves 15 10
Waterways 10 18

Mobility

Seddon sits further from the CBD (218.3 km vs 206.5 km).

Cassini Seddon
Walkability score 0/100
same for both
Distance to Adelaide 206.5 km 218.3 km
+6% vs other
Drive time (normal traffic) 220 min 239 min
Electric vehicle share 0.4%
postcode 5223
same for both
Rooftop solar per 100 dwellings 54
postcode 5223
same for both

How people get to work

Method of travel on census day 2021 — which fell during COVID restrictions, so working from home is inflated and every travel mode understated.

Cassini Seddon
Car (driver) 86.7% / 44.6%
Cassini — Car (driver): 86.7% Seddon — Car (driver): 44.6%
Worked from Home 13.3% / 32.3%
Cassini — Worked from Home: 13.3% Seddon — Worked from Home: 32.3%
Car (passenger) — / 16.9%
Cassini — Car (passenger): not among its largest Seddon — Car (passenger): 16.9%
Walked Only — / 6.2%
Cassini — Walked Only: not among its largest Seddon — Walked Only: 6.2%

Bars are drawn against the largest share shown (86.7%).

Setting

Cassini Seddon
Elevation 195 m
above sea level, at the suburb centre
 93 m
above sea level, at the suburb centre
Distance to the ocean 9.0 km 13.8 km

NBN connectivity

Cassini Seddon
Connectivity score 16/100 15/100
Most common technology Satellite (Sky Muster)
same for both
Full-fibre (FTTP) share 0%
25 premises
 0%
27 premises

Climate

Cassini Seddon
Annual rainfall 412 mm
same for both
Summer max (Jan) —
same for both
Winter min (Jul) —
same for both

Council rates

Cassini Seddon
Average residential rate $1,908/yr
same for both
Council Kangaroo Island
same for both

Federal electorate

Cassini Seddon
Division Mayo
same for both
Member Rebekha Sharkie
same for both
Party Centre Alliance
same for both

First Home Owner Grant

Cassini Seddon
Grant amount $15,000
same for both
Property price cap —
same for both
Eligibility New
same for both

Tags

Cassini

Family Rural

Seddon

Rural

More comparisons

Other comparisons with Cassini

Cassini vs Parndana Cassini vs Wisanger Cassini vs Menzies Cassini vs Duncan Cassini vs Stokes Bay

Other comparisons with Seddon

Seddon vs Parndana Seddon vs Macgillivray Seddon vs Vivonne Bay Seddon vs Duncan Seddon vs Newland
Full data on Cassini Full data on Seddon
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Information shown is provided as-is from Australian government and commercial data sources.
Always verify with the relevant authority before making property decisions.
See Data Sources and How We Calculate for details.

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