These definitions are actually irrelevant to the topic at hand. The 6000 figure posited by the OP came from a file with a specific data set. Ben114's reply about a good chunk of them being on Cape Cod is therefore either objectively true or false. If the data set doesn't include a sizable number of entries from Cape Cod, then he's wrong. If it does, then he's right.
And more to the point of rotaries... if they are included in the data set, then they're part of the 6000. If not, then they aren't.