There are at any given time people sleeping in Shomrei Shabbos and 770, and people on the streets of 13 Avenue, Kingston Avenue, Coney Island Avenue, etc.
Bill Rapfogel addressed a conference I coordinated with Uri L’Tzedek where he spoke about the Jewish working poor.
Young Baalei teshuva, Israeli yordim, ffb people who lack a good education and aren’t in kollel or yeshiva gedola, immigrants, and stam poor people who can’t get on Section 8 are basically the frum homeless.
The Met council wanted to open a frum homeless shelter that would be respectful of shabbos and kashrus, with separate sections for men and women, of course (although there are far more homeless men than women and children), but he saud that DHS and czar Bloomberg gave them too much of a hassle with red tape.