They are not as common as I once thought they were but they are still present in healthy numbers. The native mammal thread lists them as uncommon (between 5 to 10 holders) across the zoos and wildlife parks in Australia. Off the top of my head, I can think of around eleven: Australian Reptile Park (NSW), Altina Wildlife Park (NSW), Featherdale Wildlife Park (NSW), Hunter Valley Zoo (NSW), WILD LIFE Sydney Zoo (NSW), Adelaide Zoo (SA), Monarto Safari Park (SA), Cleland Wildlife Park (SA), Gorge Wildlife Park (SA), Halls Gap Zoo (VIC) and Caversham Wildlife Park (WA). Some of these places might not have this species currently but they at least did up until recently. According to the ZAA website, the programme for them is managed by Monarto and South Australia seems to be their stronghold. I am sure some smaller facilities have them as well. There are none in Queensland zoos as far I can tell as we mainly seem to reserve space for the Brush-tails instead. I could certainly see the Yellow-footed Rock Wallabies working for some of the Queensland zoos situated in more arid conditions.