Households
Household size
About this topic
Household size shows how many people live in each household. It is a basic but important measure of family life, dwelling use, and the way people share housing.
This topic helps indicate demand for different dwelling sizes and can reflect life-cycle patterns, cultural norms, and affordability pressures. It is best read with household type, age structure, and dwelling type, because changes in household size can happen for very different reasons.
Interpretation notes
- This counts the number of people usually resident in the dwelling, so it describes shared living arrangements rather than dwelling size.
- Household size should be read with bedrooms or dwelling structure before drawing conclusions about crowding or housing suitability.
Key insight
In 2021, 2 persons was the most common household size among households in Blue Mountains (C), accounting for 36.1% (11,029 households). This share was higher than Greater Sydney (30.7%). Since 2016, the biggest change was in 2 persons, which increased by 986 households and 1 percentage point.
Section overview
Household size
Blue Mountains (C) - Households (Enumerated)
This table summarises household size for Blue Mountains (C) in 2021 for persons, with comparison against Greater Sydney and change since 2016.
Household size snapshot
2021 distribution by category for Blue Mountains (C), with comparison markers for Greater Sydney.
1 person
2021 count
8,142
% of total
26.7%
Change from 2016
+0.9pp
8,142
26.7%
+0.9pp
2 persons
2021 count
11,029
% of total
36.1%
Change from 2016
+1.0pp
11,029
36.1%
+1.0pp
3 persons
2021 count
4,468
% of total
14.6%
Change from 2016
-0.5pp
4,468
14.6%
-0.5pp
4 persons
2021 count
4,333
% of total
14.2%
Change from 2016
-0.6pp
4,333
14.2%
-0.6pp
5 persons
2021 count
1,805
% of total
5.9%
Change from 2016
-0.6pp
1,805
5.9%
-0.6pp
6 or more persons
2021 count
738
% of total
2.4%
Change from 2016
-0.4pp
738
2.4%
-0.4pp
Chart view
Household size change
Absolute change in category counts between 2016 and 2021.
1 person
+756
+0.9pp
2 persons
+986
+1.0pp
3 persons
+157
-0.5pp
4 persons
+99
-0.6pp
5 persons
-69
-0.6pp
6 or more persons
-50
-0.4pp
Data table
Household size for Blue Mountains (C). Household size. 2021 and 2016 counts, percentages, and change compared with Greater Sydney.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Greater Sydney% | Count | % | Greater Sydney% | Count | pp | |
| 1 person | 8,142 | 26.7% | 23.2% | 7,386 | 25.8% | 21.6% | +756 | +0.9pp |
| 2 persons | 11,029 | 36.1% | 30.7% | 10,043 | 35.1% | 29.9% | +986 | +1.0pp |
| 3 persons | 4,468 | 14.6% | 17.2% | 4,311 | 15.1% | 17.6% | +157 | -0.5pp |
| 4 persons | 4,333 | 14.2% | 17.3% | 4,234 | 14.8% | 18.1% | +99 | -0.6pp |
| 5 persons | 1,805 | 5.9% | 7.3% | 1,874 | 6.5% | 8.0% | -69 | -0.6pp |
| 6 or more persons | 738 | 2.4% | 4.2% | 788 | 2.8% | 4.7% | -50 | -0.4pp |
| Total classifiable households | 30,528 | 100.0% | 100.0% | 28,630 | 100.0% | 100.0% | +1,898 | 0.0pp |