The Daily Beast published the 30 most Jewish Cities for Hanukah – they did it based upon:
% of Jewish population, Synagogues per capita (rank) and Kosher restaurant count (not exactly a science, considering they used Shamash.org as the source – which could use some updating! 47 Kosher restaurants in Philly?? not a chance.)
check it here: http://www.thedailybeast.com/galleries/2386/1/
More importantly they did a similar survey of 30 Most Muslim Cities (based upon Estimated Muslim Population, Total Mosques and Total Hallal Restaurants (haha) check it here (top ten muslim: Detroit, Washington DC, Cedar Rapids Iowa, Philly, NYC, Atlanta, Peoria IL, San Fran and Houston)
Here are the top 10 Jewish Cities , but it pays to check out the other 20 kinda surprising!
1. New York, New York
Jewish population: 9.6%
Synagogues per capita (rank): 4
Kosher restaurants: 504
2. Miami, Florida
Jewish population: 8.7%
Synagogues per capita (rank): 37
Kosher restaurants: 71
3. Philadelphia, PA
Jewish population: 4.6%
Synagogues per capita (rank): 1
Kosher restaurants: 47
4. Boston, MA
Jewish population: 4.3%
Synagogues per capita (rank): 13
Kosher restaurants: 48
5. Washington DC/Baltimore
Jewish population: 3.6%
Synagogues per capita (rank): 17
Kosher restaurants: 64
6. Hartford, CT
Jewish population: 2.9%
Synagogues per capita (rank): 5
Kosher restaurants: 12
7. Cleveland, OH
Jewish population: 2.9%
Synagogues per capita (rank): 6
Kosher restaurants: 19
8. Los Angeles, CA
Jewish population: 4.1%
Synagogues per capita (rank): 30
Kosher restaurants: 90
9. Las Vegas, NV
Jewish population: 4.8%
Synagogues per capita (rank): 65
Kosher restaurants: 14
10. Chicago, IL
Jewish population: 2.9%
Synagogues per capita (rank): 19
Kosher restaurants: 32
http://www.thedailybeast.com/galleries/2386/1/