In NJ it is. Jersey City, along with Newark, is considered the most developed in NJ. In the US, not sure. I believe it is one of the most diverse.--- Yes. Jersey City is the most "cosmopolitan" city...
There is no travel time unless you count the tunnel, one side is JC, the other is NYC... but if you where in the middle of JC, it would take you about 15-20 mins to get to Manhattan, not counting...