Lol, where are the streets you mention, Manhattan? I work in Manhattan for a living so it seems to me this is where you are referring to but this is an Internet forum with people from all over the world.
I get 4G LTE service in most of Manhattan on AT&T.
Yes, as mentioned above Sprint does not yet have 4G here in the city. My coworker upgraded his Evo to the latest 4G one and was shocked to learn there's no 4G here yet. He went from HSPA+ down to 3G :-\