 75.1% of people living in Greenbank were born in Australia.The other top responses for country of birth were England 5.8%, New Zealand 5.5%, Vietnam 0.9%, Taiwan 0.7%, South Africa 0.6%.87.6% of people spoke only English at home; the next most common languages were 1.5% Vietnamese, 1.1% Mandarin, 0.6% Hmong, 0.5% Mon-Khmer, 0.5% Spanish.