Jew York City is only about one mile square, around Wall Street mainly....
That's really not true. There are large areas of Brooklyn and midtown that have huge amounts of Jews in them, in particular they have some of the largest concentrations of Hasidic Jews in the world. Hell, when I go running down by the East River starting about 6 blocks from my house it's nothing but Hasidic Jews.
They definitely aren't just hanging around on the lower east side, for which I am glad. Those sabbath hats always give me a laugh.