Australia Plains is a rural locality in the Mid North region of South Australia, situated 127 km northeast of Adelaide in the Regional Council of Goyder. As of 2021, the population of Australia Plains was 41.

In the 2021 Census, Australia Plains recorded a population of 41 people, with 60.5% being male and 39.5% female. The median age in this area was 40. There were 13 families and a total of 16 private dwellings. On average, each household consisted of 2.7 people. The median weekly household income was $850, while the median monthly mortgage repayments were $1,280. The median weekly rent was $233. Additionally, there was an average of 2.5 motor vehicles per dwelling in this region.