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I live in Southern California, and I've only ever seen one 991 RS in public (parked with dealer plates, no less) and two GT4s on the road (and one was Motor Trend's press car).
Granted, I'm not counting the area surrounding Lüftgekuhlt for the obvious reason. And even then, I only saw two GT4s there.
I've seen more 918s in Denver than RS. Only saw one RS, black one yesterday, driven by another Rennlister. I've seem a bunch at the dealer getting delivered. I have seen 4-5 separate GT3s here excluding mine.