About 15 years ago we spent a couple nights in Peekskill on the east side of the Hudson. I also was surprised how almost everyone was Hispanic.
The other places that are surprising full of illegal immigrants are rural places where they work on dairy farms.
Also, a lot of the larger yogurt manufacturers factories are in NYS. I would not be surprised if those are full of illegal immigrants.
Even longer ago I took a ride up 9W on the west side and there was some kind of carnival in Newburgh - packed with newly-arrived Hispanics with tones of anchor babies. They are being trafficked here to prevent the rust-belt towns from reverting to nature...