Fortunately for me, my "village" has only one zip code and doesn't share it. Easy calculations.
Our relatively high proportion of ham ops came in handy this weekend when someone cut a fiber optic line down off the mountain. Our whole village had no internet, no landline, and no cell service for about 14 hours. Hams dispatched themselves to the nearby ski resort, the fire station, and a few other spots. I was able to learn about Verizon's progress in fixing the fiber line via 2m repeater. A couple of emergency calls from the ski resort were routed to the fire station via hams on repeaters, too. A perfect example of ham radio's importance in small, isolated communities.
As far as the difference between LA and NYC goes, I'm from LA, but don't know a lot about NYC. My impression is that more people in NYC live in apartments. In LA, most people have houses with yards, and there aren't actually too many antenna restrictions in LA.
I'm interested in percentages, not raw numbers. So far, doesn't look like any town has more than the 3% that mine has...??