Few go to Lakewood. And the community is not old enough to have very many “older singles” of its own, although at this point, there probably are several singles in their 20’s from Lakewood families. The few “older singles” that exist are scatterred and don’t really have any kind of community to my knowledge.
I don’t know about Monsey, I would guess that it has more singles than Lakewood, but probably not too many either, and whatever singles they have are probably also scatterred and don’t have a community.
The main places that singles in the US live (and have some kind of community/interaction with other singles) are Brooklyn and the Upper West Side. After that, there’s Passaic, Queens, and Washington Heights.
In just about every other part of the US(to my knowledge), there are few older singles, and they don’t have much in the way of a community.