Which are the largest frum communities in North America?
If I had to guess, and I’m probably leaving some big ones out, I’d say:
Brooklyn (Boro Park, Flatbush, Williamsburg, Crown Heights, etc.)
Monsey (including neighboring satellite frum towns)
Lakewood (including neighboring satellite frum towns)
Queens (Far Rockaway, Kew Garden Hills, etc.)
Baltimore (Silver Spring, DC, etc.)
Detroit (meaning Southfield, Oak Park)
Passaic (including Clifton)
In Europe I’d guess:
Elsewhere outside of Eretz Yisroel:
Rio de Janeiro
Why would you have to guess?
New Square is part of Spring Valley. You should have put it as a satellite community of Monsey, especially since you’re lumping all of Brooklyn together
I put New Square separately because it is demographically homogenous and notably different than the rest of the Jewish community in Rockland County. But that differentiation is a judgement call, and I can accept its inclusion as part of the Greater Monsey Jewish community.