Suburb profile
Mount Observation SA 5255
Mount Observation is located in the South East South Australia region of South Australia, postcode 5255. It has 16 properties across 3 streets, almost all houses. Explore every street in Mount Observation, its property history, homes for sale and rent, who lives there, and the local agents.
About Mount Observation
Mount Observation, SA 5255, sits in the South East South Australia region and neighbours Ashbourne, Finniss, Nangkita and Tooperang. Its 3 streets hold 16 properties, all 16 of them houses.
Census figures are for Strathalbyn Surrounds, which covers the whole suburb. At the 2021 Census the area had 7,969 residents, a median age of 47 and an average household of 2.5 people. Median household income was $1,479 a week, the median mortgage repayment $1,517 a month and the median rent $268 a week. Of 2,899 dwellings, 2,844 were separate houses, 8 semi-detached, 5 flats and 30 other; 1,172 were owned outright, 1,319 owned with a mortgage and 305 rented.
Updated October 2026
Who lives in Mount Observation
- 7,969Peoplelive in the area
- 47Median ageyears
- $1,479Median household incomea week
- $268Median renta week
Homes by type
- Houses2,844
- Townhouses and semis8
- Flats and apartments5
- Other30
Household
- Median mortgage repayment$1,517a month
- Household size2.5people on average
How homes are held
Streets in Mount Observation
Neighbouring suburbs
Addresses and streets incorporate or were developed using G-NAF © Geoscape Australia, licensed by the Commonwealth of Australia under the Open Geo-coded National Address File (G-NAF) End User Licence Agreement.
Population and housing figures are drawn from the Australian Bureau of Statistics, Census of Population and Housing 2021, licensed under Creative Commons Attribution 4.0 International.
Area summaries are generated from the national address file and ABS Census data, and checked against those figures before publication.