The Kollels are in Far Rockaway. I think even Shor yshuv which is quite large is in Far Rockaway.
For some reason, most if not all the Kollels are in the NYC part and not the Nassau County part
NYC has income tax (which Kollel guys don’t pay). Outside NYC (such as Long Island and Westchester) has no income tax, but has high real estate taxes (which kollel guys would have to pay).
Pashut.