@siracusa @atpfm Correct use of “the mainland” spotted in this street atlas (John Tauranac, “Manhattan Block by Block”, 2005) that I picked up at a used bookstore over the weekend.
@kjhealy @siracusa @atpfm Except part of New York County (Manhattan) is also on the mainland. https://en.wikipedia.org/wiki/Marble_Hill,_Manhattan
Marble Hill, Manhattan - Wikipedia

@20002ist @kjhealy @siracusa @atpfm I'm surprised at the very small and specific area called "Upper East Side", which I'd consider encompass much more of the area between E96 and E59.