Year 12 completion in the 18-29 demographic across Australia
Below are maps showing the proportion of 18- to 29-year-olds who have completed Year 12 across federal electorates, based on the 2011 Census. I've restricted the counts to the 18-29 age group because historically, high school completion rates were much lower than today; looking at year 12 completion across the whole population may therefore bias the results, with older electorates having lower year-12 completion rates. Year-12 completion rates range from 40.1% (Lingiari) to 92.7% (Ryan).
Data is via TableBuilder.