There’s actually a lot more than you’d think. I can’t speak for any moves that may have happened in the 60s/70s/80s, but the following are still (at least for sales) based at studio sites:
All the Brisbane stations
SCA Launceston
SCA Bendigo
SCA Port Pirie
SCA Whyalla
WIN Ballarat
WIN Mildura
WIN Wollongong
WIN Lismore
WIN Toowoomba
Prime7 Canberra
Seven Maroochydore
NBN Tambworth
The original TNQ-7 Townsville (now Southern Cross) studio was at the transmitter site on the top of Mount Stuart. The building still exists and houses most of the TV and Radio transmitters.
SCA Broken Hill is still at it’s original location at the transmitter site, but I don’t think there was ever a studio there.
WIN’s building in Hervey Bay is a warehouse style building that could have been a studio, but I can’t find any reference to there ever being a studio there.
WIN’s Mackay building was previous the home of Southern Cross Ten Mackay.
WIN have now moved to a small office in town, but the TV studios are still used by SCA for the radio stations.