NYC's major Jewish concentrations, from 1957. This is when the Jewish population was its peak, and captures a time when old neighborhoods were still intact but the population was shifting to central and eastern Queens, Nassau and Westchester.
https://www.jewishdatabank.org/conte...ain_Report.pdf
Manhattan
Lower East Side 70,480 33.7%
Park West 70,920 28.8%
Washington Heights 68,165 35.2%
Bronx
Hunts Point 14,810 40.9%
West Bronx 121,434 65.1%
Morrisania 72,440 32.1%
Fordham 102,481 47.8%
Tremont 42,484 32.3%
Pelham Parkway 61,629 47.6%
Brooklyn
Williamsburg 43,412 29.1%
Crown Heights 58,397 39.2%
Borough Park 63,504 55.6%
Flatbush 123,590 51.7%
East Flatbush-Brownsville 95,652 55.4%
East New York-Jamaica Bay 89,557 60.6%
Flatlands-Canarsie 28,000 63.9%
Bensonhurst 59,549 33.6%
Gravesend 51,288 50.1%
Midwood-Marine Park 64,305 45.7%
Sheepshead Bay 47,749 53.7%
Coney Island-Manhattan Beach 44,659 59.8%
Queens
Forest Hills, Rego Park 73,462 66.2%
Bayside-Oakland Gardens 39,030 42.8%
Central Queens 50,672 43.6%
Douglaston, Little Neck, Bellerose 31,525 39.5%
Rockaway 29,605 46%
Nassau
North Hempstead 55,600 27%
Oyster Bay 55,200 20.9%
Hempstead 218,300 31.9%
Westchester
New Rochelle 22,500 31.2%