Below are stats for participation in simchaintiatives.com by city . . It's interesting though I'm not sure you can definitively draw any conclusions from the data.
(this covers about 90% of the ~1250 who signed up. I used an excel macro so it excludes entries with spelling errors and locations with few participants etc).
Seems to me that other than queens this correlates very closely to population
Eta once you combine queens and Kew gardens it fits into place as well.
I didn't calculate exact numbers, just a parsing.