In 2021, 80.7 per cent of the Mount Larcom population was born in Australia compared to 79.6 per cent in the Gladstone Region.

A further 4 per cent were born overseas from, England, Sri Lanka and Thailand. 12 per cent did not state their country of birth.

The community of Mount Larcom includes 17 Aboriginal and Torres Strait Islander people, which is 5 per cent of the population. There has been a minimal increase in the number of Aboriginal and Torres Strait Island people in Mount Larcom between 2016 and 2021, with an increase of one person.

English is the main language spoken at home for 84 per cent of the community in Mount Larcom, compared to 87.1 per cent in the Gladstone Region.  In 2021, 4.5 per cent of households in the Mount Larcom community speak another language other than English at home.