@Giant Eland Seven in the wild and seven in zoos (if the one at TWP is a Wilkin's) with one species in both lists (though different subspecies). Four left to go.
And was denied seeing the off exhibit (Petrogale brachyotis) Short-eared rock-wallaby at Perth. But not for lack of effort. Would those be the same 7 you've seen in zoos?
And wow 7 more in the wild!? That'll have to be my goal next time I'm in the area. What part of the country could I see the most species that I haven't already seen in zoos? How difficult are they to find in the wild?
@Najade is the specialist on this, but eastern Queensland is home to a complex of nine species (according to my Menkhorst guide, but maybe there have been some taxonomic changes), so that part of Australia probably has the most species without captive populations.
I considered my rock wallaby list quite nice with two species in zoos (Yellow-footed and Brush-tailed) and two species in the wild (Black-footed and Short-eared, although the latter is now considered to be a Wilkin's), until I read the reports and saw the photos of Najade's recent trip to Queensland...
@Giant Eland Yes, that's the seven I saw in zoos and that's the only ones that are kept atm as far as I know. (And good thing too, because Nabarlek is pretty much impossible in the wild.)
As AWP stated Queensland would be the place with most rock-wallabies, second best option would be northern part of WA.