Research · Australia
Australian Family Statistics: Households, Ancestry, and Family History
Every figure below comes from the Australian Bureau of Statistics or from peer-reviewed research, and carries the measurement period its source attaches to it. Each statistic is labelled with the kind of organisation that published it, so the evidence behind a number is visible without opening the source. Where a source states a limitation on its own data, that limitation is reproduced rather than dropped.
Key findings
- The 2021 Census counted about 6 million Australian families, but a couple with children living at home is now only 43.7% of them.
- Households are projected to grow faster than the population — from 10.0 million in 2021 to as many as 13.9 million by 2046 — because the same relatives are spreading across more addresses.
- 48.2% of Australians have a parent born overseas, so most family histories here cross a border within living memory, into archives held in another country.
- The median marriage that ends in divorce lasts 13.4 years, and the fertility rate has fallen to 1.481 births per woman. Both make a family tree harder to draw from memory alone.
- Median age at death is 79.6 for men and 84.7 for women. The window for asking the oldest generation what they remember is finite, and it is the one input no software can regenerate.
- Peer-reviewed research links knowing family history to better-measured well-being, but the finding is correlational and is United States research. It is not evidence that building a family tree causes an outcome.
What Australian families look like now
How many families are there in Australia, and what kinds?
The 2021 Census counted about 6 million families. The single largest group is still a couple with children living with them, but it is a minority of all families — and the households those families live in are getting smaller.
5,552,973
couple families
The 2021 Census counted 5,552,973 couple families. Of these, 53.0% had children living with them and 47.0% did not.
Official statistics2021 Census (Census night 10 August 2021)Australian Bureau of Statistics (ABS)
1,068,268
one-parent families
There were 1,068,268 one-parent families, and four out of every five of those parents were female.
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
2,550,284
families with a child under 15
More than 2.5 million families — 2,550,284 — included at least one child aged under 15 years.
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
23,914
same-sex marriages counted
Nearly 25,000 same-sex marriages — 23,914 — were counted, the first Census to record them at scale following the 2017 change to Australian marriage law.
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
2.5
people per household, on average
The average number of people per household fell from 2.6 in 2016 to 2.5 in 2021. The Census counted more than 10.8 million private dwellings.
Official statistics2016 to 2021 CensusesAustralian Bureau of Statistics (ABS)
Australian families by composition
Couples with children are the largest group, but they are not a majority — couples with no children sit only five percentage points behind, and together the two childless-at-home categories outnumber them.
Measured in % of all families.
View the data as a table
| Category | % of all families |
|---|---|
| Couple with children | 43.7% |
| Couple, no children | 38.8% |
| One-parent family | 15.9% |
| Other composition | 1.6% |
Households are multiplying faster than people
How are Australian households projected to change by 2046?
The ABS projects households growing faster than the population itself, because the same number of relatives is spreading across more addresses. Lone-person households are the clearest signal: a family that once shared one home now spans several, and no single household holds the whole story.
10.0m → 13.3–13.9m
households in Australia
Households are projected to grow from 10.0 million in 2021 to between 13.3 million and 13.9 million in 2046, depending on the projection series.
Official statistics2021 base year, projected to 2046Australian Bureau of Statistics (ABS)
3.4–4.0m
lone-person households projected for 2046
Lone-person households are projected to rise from 2.6 million in 2021 to between 3.4 million and 4.0 million in 2046, remaining 26% to 28% of all households.
Official statistics2021 base year, projected to 2046Australian Bureau of Statistics (ABS)
3.1m → 4.1m
couple families with children
Couple families with children are projected to grow from 3.1 million in 2021 to 4.1 million in 2046, which would be 42% to 43% of all families.
Official statistics2021 base year, projected to 2046Australian Bureau of Statistics (ABS)
2.8m → 3.8–3.9m
couple families without children
Couple families without children are projected to grow from 2.8 million in 2021 to between 3.8 million and 3.9 million in 2046, which would be 38% to 40% of all families.
Official statistics2021 base year, projected to 2046Australian Bureau of Statistics (ABS)
Where Australian families came from
How many Australians have overseas family origins?
Australia is a country where most family histories cross a border within living memory. That is the practical reason family history here is hard to reconstruct from records alone: the records are in another country, in another language, and often in another archive system.
48.2%
of Australians have a parent born overseas
Almost half of Australians — 48.2% — have at least one parent born overseas.
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
27.6%
of Australians were born overseas
27.6% of the population reported a birthplace outside Australia.
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
250+
ancestries reported
The Census collected information on more than 250 ancestries and 350 languages. Respondents could report up to two ancestries each.
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
33.0%
reported English ancestry
The five most commonly reported ancestries were English (33.0%), Australian (29.9%), Irish (9.5%), Scottish (8.6%), and Chinese (5.5%).
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
927,490
residents born in England
The largest overseas countries of birth were England (927,490), India (673,352), China (549,618), New Zealand (530,492), and the Philippines (293,892).
Official statistics2021 CensusAustralian Bureau of Statistics (ABS)
Largest overseas countries of birth
England remains the single largest source, but the next three are all Asian or Pacific. A family-history tool that assumes British records is serving a shrinking share of the country.
Measured in residents.
View the data as a table
| Category | residents |
|---|---|
| England | 927,490 |
| India | 673,352 |
| China | 549,618 |
| New Zealand | 530,492 |
| Philippines | 293,892 |
How families form, change, and get complicated
What do current marriage, divorce, and birth figures show?
Marriages are falling, divorces rose in the most recent year, and families are smaller than the generation before them. Each of these makes a family tree harder to draw, not easier: fewer siblings to remember jointly, and more re-partnering to record accurately.
118,804
marriages registered
118,804 marriages were registered in 2025, a decrease of 1.7% on 2024. The crude marriage rate was 5.3 per 1,000 people.
Official statistics2025 registrationsAustralian Bureau of Statistics (ABS)
49,158
divorces granted
49,158 divorces were granted in 2025, an increase of 4.1% on 2024. The crude divorce rate was 2.2 per 1,000 people.
Official statistics2025 registrationsAustralian Bureau of Statistics (ABS)
13.4 years
median duration of marriage to divorce
The median duration from marriage to divorce was 13.4 years. Median age at divorce was 47.3 years for males and 44.4 years for females.
Official statistics2025 registrationsAustralian Bureau of Statistics (ABS)
1.481
births per woman
The total fertility rate was 1.481 births per woman in 2024, down from 1.499 in 2023. There were 292,318 registered births.
Official statistics2024 registrationsAustralian Bureau of Statistics (ABS)
32.1 / 33.9
median age of mothers and fathers
The median age of mothers was 32.1 years and of fathers 33.9 years. Later parenthood lengthens the gap between generations, which shortens the overlap between a child and their grandparents.
Official statistics2024 registrationsAustralian Bureau of Statistics (ABS)
The window for asking the oldest generation
How long is the window to record what older relatives remember?
Family history has a deadline that no software changes. The figures below are the plainest argument for recording what the oldest generation knows before it has to be reconstructed from documents.
81.1 / 85.1
years life expectancy at birth
Life expectancy at birth was 81.1 years for males and 85.1 years for females, unchanged from the previous period.
Official statistics2022–2024 life tablesAustralian Bureau of Statistics (ABS)
79.6 / 84.7
median age at death
The median age at death was 79.6 years for males and 84.7 years for females.
Official statistics2024 registrationsAustralian Bureau of Statistics (ABS)
187,268
deaths registered
187,268 deaths were registered in 2024, an increase of 4,137 on 2023. Each one closes a first-hand account of a family that was not necessarily written down.
Official statistics2024 registrationsAustralian Bureau of Statistics (ABS)
What the research says about knowing your family history
Does knowing your family history matter?
There is a peer-reviewed literature here, and it is worth reading precisely. The findings are correlational: they show that knowing more family history goes together with certain outcomes, not that learning it produces them. Both studies below are United States research.
20 questions
in the Do You Know scale
Duke, Lazarus and Fivush introduced the Do You Know scale, a set of 20 yes/no questions measuring what an adolescent knows about their family history — facts they could not have learned first-hand, such as where their grandparents grew up or how their parents met.
Peer reviewedPublished 2008 (United States)Duke, Lazarus and Fivush, Psychotherapy: Theory, Research, Practice, Training, 45(2), 268–272 (peer reviewed)
Correlational
association, not causation
Reviewing that work, Gardella and colleagues state that greater knowledge of family history, as measured by the Do You Know scale, is significantly correlated with internal locus of control, higher self-esteem, better family functioning, greater family cohesiveness, lower levels of anxiety, and lower incidence of externalising behaviours. These are associations; the studies do not establish that learning family history causes those outcomes.
Peer reviewedReported 2021, reviewing research published from 2008Gardella, Parnes, Hirst and Brown, Frontiers in Psychology (peer reviewed)
147
women in the analysed sample
A study of 150 emerging adult sexual minority women, 147 of whom were included in the final analysis, found that greater knowledge of chosen family history was associated with lower depressive symptoms — extending the finding beyond biological family lines.
Peer reviewedPublished 2021 (United States)Gardella, Parnes, Hirst and Brown, Frontiers in Psychology (peer reviewed)
What the 2026 Census will count for the first time
What new family data is the 2026 Census collecting?
The 2026 Census adds a variable that Australian family data has not had before: whether a household spans three generations. Multigenerational living has been visible anecdotally for years without appearing as a countable household type.
New in 2026
multigenerational household composition
Multigenerational household composition is a new variable for the 2026 Census. The ABS defines a multigenerational household as one with three or more generations from the same family line who are usually resident in the same household.
Official statistics2026 Census (dictionary published 21 July 2026)Australian Bureau of Statistics (ABS)
What the numbers mean for recording a family history
Read together, these figures describe a family record that is getting harder to assemble from documents and easier to lose from memory. Households are multiplying faster than the population, which means the same family now spans more addresses, more filing systems, and more shoeboxes of photographs. Nobody is the default keeper of the record any more, because there is no longer a default household.
The ancestry figures explain why record search alone does not solve this in Australia. With 48.2% of Australians having a parent born overseas and more than 250 ancestries reported, the documents that would settle a question about a grandparent are frequently held in a foreign archive, in a language the family may no longer read, under a name that changed at a border. The most reliable source in that situation is a living relative, and living relatives are a source with an expiry date: median age at death is 79.6 years for men and 84.7 for women.
Family structure adds a second problem. A median 13.4 years from marriage to divorce, a fertility rate of 1.481, and later parenthood together produce trees that are narrower, deeper, and more branched by re-partnering than the ones on the wall in a family home a generation ago. A chart format that assumes one couple and their children does not fit the families the Census is actually counting, which is part of why the 2026 Census is adding multigenerational households as a countable type for the first time.
The research section deserves care rather than enthusiasm. The Do You Know work is genuinely interesting, and it is genuinely correlational: adolescents who know more about their family history also tend to score better on several well-being measures, which is not the same as showing that learning the history produced the score. It is also United States research. It is a reason to think family knowledge is worth preserving; it is not a promise about what preserving it will do.
Holo Family is the HoloCare product built for this task: recording relatives, relationships, photos, and stories in one chart that relatives can view and build together, with GEDCOM import and export so the record outlives the software it was drawn in. Nothing on this page is a claim about what Holo Family achieves — these are third-party statistics about Australian families, published here because they are hard to find in one place.
Frequently asked questions
- How many families are there in Australia?
- The 2021 Census counted about 6 million families: 5,552,973 couple families and 1,068,268 one-parent families. Couples with children made up 43.7% of all families, couples without children 38.8%, one-parent families 15.9%, and other compositions 1.6%. The figures come from the Australian Bureau of Statistics and describe Census night, 10 August 2021.
- What is the average Australian household size?
- The average Australian household contained 2.5 people at the 2021 Census, down from 2.6 in 2016. The ABS projects households growing from 10.0 million in 2021 to between 13.3 million and 13.9 million by 2046, with lone-person households reaching between 3.4 million and 4.0 million.
- How many Australians have a parent born overseas?
- 48.2% of Australians have at least one parent born overseas, and 27.6% were born overseas themselves, according to the 2021 Census. The Census collected information on more than 250 ancestries and 350 languages. The most commonly reported ancestries were English (33.0%), Australian (29.9%), Irish (9.5%), Scottish (8.6%), and Chinese (5.5%).
- What is the divorce rate in Australia?
- There were 49,158 divorces granted in Australia in 2025, a crude divorce rate of 2.2 per 1,000 people and an increase of 4.1% on 2024. The median duration from marriage to divorce was 13.4 years. In the same year 118,804 marriages were registered, a decrease of 1.7%.
- What is Australia’s fertility rate?
- Australia’s total fertility rate was 1.481 births per woman in 2024, down from 1.499 in 2023, with 292,318 registered births. The median age of mothers was 32.1 years and of fathers 33.9 years.
- Does knowing your family history actually matter?
- Peer-reviewed research reports an association, not a cause. Reviewing work built on the Do You Know scale — 20 questions about family history that an adolescent could not have learned first-hand — Gardella and colleagues state that greater knowledge of family history is significantly correlated with internal locus of control, higher self-esteem, better family functioning, greater family cohesiveness, lower anxiety, and lower incidence of externalising behaviours. These are United States studies and they are correlational: they do not establish that learning family history produces those outcomes.
- Is the 2026 Census collecting new family data?
- Yes. Multigenerational household composition is a new variable for the 2026 Australian Census. The ABS defines a multigenerational household as one with three or more generations from the same family line who are usually resident in the same household, so this household type becomes countable for the first time.
- Where do these Australian family statistics come from?
- Every figure on this page is drawn from the Australian Bureau of Statistics or from peer-reviewed research published under a DOI, and each one is shown with the measurement period its source attaches to it. HoloCare did not run a survey and does not claim any of these findings as its own research. The full source list, with publication and access dates, is published at the foot of the page.
Methodology, limitations, and how to cite this page
This page collects published statistics. HoloCare did not run a survey and does not claim any of these findings as its own research. Figures are transcribed from the cited release, with the source’s own wording preserved where a qualifier changes the meaning.
Limitations to read alongside the figures
- Census figures describe Census night, 10 August 2021. They are a snapshot, not a current count, and the 2026 Census will supersede them.
- Projections are not forecasts. The ABS publishes three series on different assumptions about living arrangements, and the ranges quoted here span those series rather than predicting one outcome.
- Census, projection, registration-year, and life-table figures describe different moments and different populations. They should not be combined into a single point-in-time picture.
- Marriage and divorce counts are registrations and grants in a given year, not the proportion of marriages that end in divorce. A crude divorce rate of 2.2 per 1,000 people is not a percentage of marriages.
- Ancestry in the Census is self-identified, and respondents could report up to two ancestries. It is a statement of how people describe themselves, not a genealogical or genetic finding.
- The two well-being studies are United States research with modest samples, and both report associations rather than causal effects. Neither should be read as evidence that building a family tree improves well-being.
- Life expectancy figures for 2022–2024 cover a period affected by COVID-19 mortality, which the ABS notes in its own commentary.
- This page is general information about Australian family demography. It is not legal, clinical, or financial advice.
Citation
This page is free to cite and quote with attribution. Individual figures have their own anchors, so a citation can link directly to the statistic it references.
HoloCare Editorial Team, “Australian Family Statistics: Households, Ancestry, and Family History”, HoloCare, 3 September 2026, https://www.holocare.app/resources/australian-family-statistics
Next scheduled review: 2026-12-03, or earlier if a cited source publishes a new release. Found an error? Report it through our corrections process.
Sources
- Household and families: Census, 2021Australian Bureau of Statistics (ABS) · Published 28 June 2022 (2021 Census, Census night 10 August 2021) · Accessed 3 September 2026
- 2021 Census shows changing face of Australia’s 6 million familiesAustralian Bureau of Statistics (ABS) · Published 28 June 2022 (2021 Census) · Accessed 3 September 2026
- Snapshot of Australia, 2021Australian Bureau of Statistics (ABS) · Published 28 June 2022 (2021 Census, updated 12 October 2022) · Accessed 3 September 2026
- Household and Family Projections, Australia, 2021–2046Australian Bureau of Statistics (ABS) · Published 28 June 2024 (2021 base year, projected to 2046) · Accessed 3 September 2026
- Cultural diversity: Census, 2021Australian Bureau of Statistics (ABS) · Published 28 June 2022 (2021 Census) · Accessed 3 September 2026
- 2021 Census: Nearly half of Australians have a parent born overseasAustralian Bureau of Statistics (ABS) · Published 28 June 2022 (2021 Census) · Accessed 3 September 2026
- Marriages and Divorces, AustraliaAustralian Bureau of Statistics (ABS) · Published 28 July 2026 (2025 registrations) · Accessed 3 September 2026
- Births, AustraliaAustralian Bureau of Statistics (ABS) · Published 15 October 2025 (2024 registrations) · Accessed 3 September 2026
- Life expectancyAustralian Bureau of Statistics (ABS) · Published 11 November 2025 (2022–2024 life tables) · Accessed 3 September 2026
- Deaths, AustraliaAustralian Bureau of Statistics (ABS) · Published 26 September 2025 (2024 registrations) · Accessed 3 September 2026
- Multigenerational household composition (MHCD), Census dictionary 2026Australian Bureau of Statistics (ABS) · Published 21 July 2026 (2026 Census) · Accessed 3 September 2026
- Knowledge of family history as a clinically useful index of psychological well-being and prognosis: A brief reportDuke, Lazarus and Fivush, Psychotherapy: Theory, Research, Practice, Training, 45(2), 268–272 (peer reviewed) · Published 2008 (United States) · Accessed 3 September 2026
- Knowledge of Chosen Family History and Depressive Symptoms in Sexual Minority WomenGardella, Parnes, Hirst and Brown, Frontiers in Psychology (peer reviewed) · Published 2021 (United States, n = 150 recruited, 147 analysed) · Accessed 3 September 2026
Related reading
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