What countries are Dutch?

Got 2 answers for you, if you mean the language as in where in the world are people speaking dutch as language i know of The Netherlands (ofcourse) and around The Cape in South Africa, its called Cape-Dutch. Essentially if you would be dutch and listen very carefully to every word you can communicate haha.

And if you litteraly meant which countries are dutch, well, only The Netherlands ofcourse. Thoug centuries ago the dutch were settled in pretty good around New York NY(New Amsterdam), Jersey NY, Albany NY (near Albany there is even a town called Rotterdam, same as in The Netherlands)

Hope this helped!