How population-dense is your suburb?

Liam Mannix has asked the question How population-dense is your suburb? in an article for InDaily.

Taking a broader view, it is apparent that the most dense areas of Adelaide are the inner-ring suburbs. ... Even though the city has doubled its population and density in the last decade, inner-city density is still well below the average of the surrounding suburbs.

Overall Greater Adelaide has a density of 18 people per square hectare. That puts us below Greater Sydney (27.6 people per sq h) and Melbourne (21.1 people), but above Brisbane, Perth and the ACT.