Apartment complexes in California generally have outdoor, separate entrances to each apartment. (there's an easier way to say that, but i can't think of it right now)
Anyway, in MN, we shared a hallway with every other apt in the building...well, on our floor. Made it very interesting during dinner time, as we were a diverse little complex...yes, even in Minnesota.
I have my own little house out here, but I've noticed that all apartment complexes in my 'hood have separate entrances. That'd be kinda cool.