Subiaco had a population of 9,940 at the
2021 Australian census. This is an increase on the 9,202 recorded at the
2016 Australian census, the 8,015 recorded at the
2011 census, the 7,629 recorded at the
2006 census, and the 7,127 recorded at the
2001 census. 47.8% of residents were male, and 52.2% of residents were female. The median age was 40, above the state and national median of 38. At the 2016 census, 56.5% of Subiaco households were families, below the state average of 71.2%; 39.0% were single person households, compared to the state average of 25.4%; and 4.5% were group households, compared to the state average of 3.4%. Of those family households, 49.5% were couples without children, 36.6% were couples with children, 12.0% were single parents with children, and 1.6% were some other type of family. The state averages were 38.8%, 44.6%, 15.1% and 1.6% respectively. The average number of people per household was 2.1, compared to the state average of 2.5. Of the suburb's 5,333 dwellings, 4,482 were occupied at the 2021 census and 610 were unoccupied. Out of the 4,482 occupied dwellings, 38.8% were detached, far lower than the state average of 79.7%; 19.3% were semi detached, higher than the state average of 13.0%; 41.7% were a flat or apartment, far higher than the state average of 6.5%; and 0.1% were of some other type of dwelling. The average number of bedrooms per dwelling was 2.4, which is lower than the state average of 3.3. 28.7% were owned outright, close to the state average of 29.2%; 24.1% were owned with a mortgage, below the state average of 40.0%; 45.0% were rented, above the state average of 27.3%; and 1.9% were some other tenure type or not stated, compared to the state average of 3.5%. At the 2016 census, the median weekly personal income was $1,330, compared to the state average of $848 and national average of $805; the median weekly family income was $3,315, compared to the state average of $2,214 and national average of $2,120; and the median weekly household income was $2,219, compared to the state average of $1,815 and the national average of $1,746. Professionals and managers were the most common professions for those employed living in Subiaco, at 48.4% and 16.1% of residents respectively. Clerical and administrative workers were 10.2% of those employed, community and personal service workers were 7.6%, and sales workers were 5.7%. Blue collar jobs were low, with technicians and trades workers at 5.8%, labourers at 3.5%, and machinery operators and drivers at 1.4%. The most common industries of employment were hospitals (except psychiatric hospitals) (8.8%), legal services (3.4%), higher education (3.1%), cafes and restaurants (2.6%), and iron ore mining (2.4%). 56.2% of residents aged 15 years or older had a bachelors degree or above, significantly higher than the state average of 23.8%. The most common ancestries that people identified with at the 2016 census were English (38.2%), Australian (24.3%), Irish (13.3%), Scottish (10.7%), and Chinese (7.2%). 57.7% of residents were born in the country, slightly below the state average of 62.0%. The next most common birthplaces were England (8.1%), Malaysia (2.0%), New Zealand (1.8%), Ireland (1.7%), and South Africa (1.7%). 45.0% of residents had both parents born outside Australia and 34.1% had both parents born in Australia. The most common religious affiliations were no religion (47.5%),
Catholic (18.0%),
Anglican (10.4%), and
Buddhism (2.4%). 7.1% of residents did not state their religion. ==Landmarks==