And not to post a third time, but I was just thinking to myself "Huh, census.gov could help us with this question!" Except I then remembered they won't touch religion questions with a ten foot pole, so you'd have to get population density data from them and distribution of Jews from some other source and overlay it with GIS software, and I just don't have the librarian fu for that. And it's really only accessory to your query anyway. But it got me thinking. I should shut up and go work now.
Census.gov won't help you, but the Association of Religion Data Archives will provide the missing religious statistics, with very nice color-coded maps, broken down to the county level). It will also provide mundane demographic information in exactly the same graphic format, which facilitates the identification of correlations. Sadly, the data is getting a bit long in the tooth (it dates back to 2000), but it's still pretty spiffy.
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Here are some statistics... knock yourself out