I live in the only city in NZ which uses a US style gridblock numbering system, and here the "East" and "West" are definitely considered part of the name. Being topworlders, of course, we put the direction in the proper place, at the end. My former address for example was "915 Heretaunga St East", often written as "915E". A friend lives at 702 Park Rd North, or 702N Park Rd. The compass point is inseparably part of the address, but the street's name is not the compass point. The curious thing is that we do not use the street/avenue naming convention. Another city in NZ does, but it does not use the gridblock numbering. I don't know if that city's numbered avenues and streets have East and West.