The northern part of the suburb was gazetted in 1972 by the Town of Geraldton,[2] and the southern part was gazetted in 1979 by the Shire of Greenough.[3]
In the 2006 census, Mount Tarcoola had a population of 3,566,[5] representing a growth of 557 people (18.5%) since the 2001 census.
Mount Tarcoola residents had a median age of 34, and the median individual income was $570 per week, compared with $461 per week for the Geraldton region as a whole. The population of Mount Tarcoola was predominantly Australian-born - 82.2% as at the 2006 census - while 5.02% were born in the United Kingdom. A small Cocos Malay population was identified in the suburb, with 2.9% practising Islam and 2.2% speaking Malay at home.