[niwell]

Having the most impressive art deco towers doesn't necessarily mean the most art deco buildings. I'd agree with NYC at number 1 and Miami being in the mix, but other than that it's up in the air.

Lots of colonial countries embraced the style just as much as the US just tended not to build massive towers, though there are iconic train stations and the like. Not experiencing the effects of Depression to the same degree certainly helped with proliferation of the style. For instance I'd put money on Johannesburg having more deco structures than Detroit, even though latter may have more iconic deco buildings (the gap isn't as large as one may assume though). Certain streets are lined with the style, but many of the buildings are in rough shape. Colonial interpretations of deco do tend to be more subdued than the US, which again may not be surprising.

Canada's actually a bit of an outlier compared to other commonwealth nations in that deco isn't nearly as prevalent. Toronto does have a number of interesting late deco structures that were delayed by the depression / WWII and ended up being built with modernist influences, but that's an aside.