New modelling puts Australia’s pre-colonial Indigenous population at 2.2 million

New demographic modelling estimates that about 2.2 million Aboriginal and Torres Strait Islander people lived in Australia before British colonisation began in 1788. The figure, reported on 15 September, is dramatically higher than the continent-wide estimates that shaped much of the earlier historical record and suggests that the subsequent population collapse was larger than commonly understood.

Researchers also estimated approximately 2.06 million excess deaths between 1788 and 1861, leaving the Indigenous population at roughly 7% of its pre-colonial level. The authors connected that collapse to introduced diseases, frontier violence, dispossession and malnutrition. These figures are modelled estimates rather than a retrospective census, making their assumptions and uncertainty important to future scrutiny.

How the estimate was constructed

The research team combined several kinds of evidence instead of projecting backwards from colonial headcounts alone. Its methods included archaeological records, reconstructions of climate and land productivity, and genetic information used to infer earlier population size. Ethnographic estimates were reviewed but were not treated as the model’s principal foundation.

That approach matters because many early observations were recorded only after disease and colonial violence had already altered communities. The first widely cited continent-wide estimate placed the population between 250,000 and 300,000. Later scholars proposed higher totals, including estimates around 750,000, 900,000 and as much as 1.3 million, but no systematic pre-1788 census existed.

Why the finding matters now

The new estimate does not merely revise an old statistical debate. It changes the scale at which policymakers, educators and the public may understand colonisation’s demographic consequences. It also strengthens the case for Indigenous participation in decisions about historical truth-telling, land, culture and reconciliation, while leaving room for specialists to test the model and its regional assumptions.

The United Nations’ Indigenous-rights mechanism has recently heard Australian representatives argue that colonisation’s consequences remain visible in unresolved land claims and limited decision-making authority. The mechanism’s mandate centres on helping states implement Indigenous rights, including participation and self-determination. That context explains why a revised population baseline can carry consequences beyond academic demography.

Official material submitted through the UN system had previously cited a broad pre-colonial range of 300,000 to one million people and noted more than 500 distinct tribal nations and over 250 languages. The new 2.2 million estimate substantially exceeds that range. The next questions are whether other researchers reproduce the result, how estimates vary across regions and how Australian institutions incorporate the findings into policy and public history.