Using #s from wikipedia Jewish population by metro area (#s in thousands) using top 10 US metro areas just for a ballpark figure.
Northeast: 2,279
NYC 1,600
Boston 248
D.C. 216
Philly 215
West: 847
LA 519
San Fran 228
San Diego 100
Midwest: 292
Chicago 292
South: 239
Atlanta 120
Miami 119
Not in the top 10:
Cleveland 87
Detroit 72
Cincinnati 27
Milwaukee 26
Columbus 23
NCB – I think you are underestimating the numbers on the West Coast even if you assume there are a lot of questionably Jewish people in interfaith families out there.