If you are going to talk about New York area courses, meaning the New York City area, it makes no sense to only limit this to courses within the 5 boroughs. If you live in NYC, you have the option to play courses in Long Island, Westchester, and North Jersey. The Golf Guides, which has been around for decades and pre-internet published guides, lists all courses it considers in the NY Metro area. That is a third-party source. Why can't you just accept that? If you live in Queens, it makes no difference to drive to a course in Long Island compared to a course in Brooklyn. If you live in the Bronx, you can drive to a course in Westchester or New Jersey easier than getting to a course in Staten Island. These are all NY area courses.
http://golfguidesusa.com/