Harlaxton is the most socio-economically disadvantaged suburb in Toowoomba; at the 2006 census, residents had a median individual income of $366, compared with $448 for the Toowoomba statistical district, and a median family income of $881 compared to $1,116. The suburb had a
SEIFA score of 903, placing it below all other suburbs in the district. In the , Harlaxton had a population of 2,547 people. Aboriginal and Torres Strait Islander people made up 7.2% of the population. 81.1% of people were born in Australia. 86.9% of people spoke only English at home. The most common responses for religion were No Religion 24.9%, Catholic 21.3% and Anglican 15.6%. == Heritage listings ==