I don't have a review to reference, but I've heard that certain companies stopped hiring in Colorado, they even explicitly excluded Coloradoan in their job listings. Here is a website tracking companies that do it: https://www.coloradoexcluded.com/
So CO/NYC/WA/CA will be ~62M Americans, and if NY gets added, ~74M Americans.
I'm starting to see more and more companies listings a Colorado salary range in recent listings.