Or Seattle area. On east coast, even in big places like NYC or Chicago, seeing a Tesla still feels like an uncommon occurrence. In Seattle or Bay Area, you cannot drive through an intersection without seeing at least one (or, more often, more than one) Tesla.

Yep. I see them rarely enough that they are noticable when I do see them. I see one or two a week, probably.

They seem to be common in RI and more generally in Atlantic New England. Not sure if it has something to do with state incentives or just a culture thing.

You're assuming they are in the US. In Norwegian cities (e.g. Oslo, Stavanger), Teslas are everywhere because of the high value of the Norwegian Kroner, high local wages, and government subsidies on EVs.

In some European cities they seem to be over-represented too, such as Amsterdam.

Even in old prussiab Brandenburg I see a lot of Teslas. Berlins waste fat. But we're about to open a factory.