I’m an Australian, and I also don’t know why I know Oodnadatta! Probably it’s just one of those words that sticks in the brain, and it comes up every so often because it is a key point between Adelaide and Darwin.

https://en.wikipedia.org/wiki/Oodnadatta (population 102)

Wittenoom, WA - population 0

I didn’t instantly recognise the name, but I’ve heard the story.

Coober Pedy, SA - population 1437

This is a very solid one.

@gnu@lemmy.zip beat me to the punch with Port Arthur, and I think they’ve hit the nail on the head there. Although, as they note, maybe the name recognition isn’t there for younger generations.

Here’s some suggestions that haven’t been made yet:

• Gundegai - population 2,057 (2021 census) - https://en.wikipedia.org/wiki/Gundagai
  • Featured in songs and poetry, most famously Along the Road to Gundegai
  • ‘The Dog on the Tucker Box’ sits on the road outside the town (and is itself a reference to a poem mentioning Gundegai)
• Betoota - population 3 (2023) - https://en.wikipedia.org/wiki/Betoota,_Queensland
  • Known because its name was adopted by the satirical news website The Betoota Advocate