Not a place? Wikipedia disagrees. Gosford also has less than 5,000 people, versus Central Coast's 300,000+.
With the decline in the steel industry, as well as the reality that they have for many years themselves became commuter belt, both Newcastle and especially Wollongong are effectively "satellites" of Sydney just like the Central Coast & Blue Mountains. For Sydney's population, it should really be the whole "Sydney Basin" region
Similarly, you should probably include Geelong into the Melbourne total. Likewise, both Gold Coast & Sunshine Coast are effectively conjoined onto Brisbane metro although arguably they are slightly more economically "independent of the major city than those in the southern states
"I'm from Whynot" or "I'm from Dildo"
Also Apple's Headquarters address is - 1 Infinite loop,