I'm not sure I've paid attention to my fellow bus passengers to enough of a degree to do that - mostly I'm just aware of how white people are not the vast majority (contrast to anywhere in Wisconsin except Milwaukee) and yet I am not the only white person (contrast to LA). But it's true that, when I've walked into the blue areas of West Philly, I have seen pretty much only black people - at one point, shortly after I moved, I was asked whether I was lost while exploring the 10 block radius of my apartment.