Wanniassa (postcode 2903) is a suburb in Australia's capital, Canberra: more specifically, in the city's southern district of Tuggeranong. The suburb takes its name from a pastoral property granted to Thomas McQuoid in 1835, which he named after Wanayasa in West Java, Indonesia, where McQuoid had previously owned property. Streets are named after Victorian state politicians and the suburb was gazetted on 21 May 1974.

It is next to the suburbs of Kambah, Greenway, Oxley, Monash, Gowrie and Fadden. It is bounded by Athllon Drive, Sulwood Drive, Erindale Drive and Taverner Street.

At the 2016 census, Wanniassa had a population of 7,512. The median age of people in Wanniassa was 39 years, compared to a median age of 35 for Canberra. The median individual income for Wanniassa in 2016 was $927, below the Canberra average of $998, while the median household income was $1,961. In 2016, the median monthly housing loan repayment in Wanniassa was $2,000.

The residents of Wanniassa are predominantly Australian born, with 74.0% being born in Australia. The three main countries of birth for those born overseas were England, 3.8%, India, 1.7% and New Zealand, 1.4%. The most popular religious affiliations in descending order are no religion, Catholic and Anglican.

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