Zip Code 11204 has 74,880 people
Instead of debating, you can go to Census.gov and get census information by Zip code or go to Wikipedia and get census information.
Not everyone in a particular area is Jewish or frum even in Borough park. I dont think any area has more than 50-75% frum (75% would be Borough Park or Monsey)
Williamsburgh it would be about 50% (maybe even lower) lots of hippies and latinos live there