Poland. In one of the top5 cities here but nevertheless, even if I'm visiting much smaller ones it's hard to find a place where you cannot pay in a contactless fashion.
This PayPass, or whatever is called, technology really took off here in the last 5 years.
Outside the United States.
That was easy enough to infer, what wasn't was where in the world contact-less payment systems came to dominate. Even in Europe chip appears to be the norm. China? Japan?
In UK and AU, contactless payments dominate, particularly for low value transactions. I suspect that's the case in Japan too.
China has a mishmash of system from in-app payments (a la WeChat) to QR-code based systems.