I only proposed getting rid of the state field, not the city. I have no idea whether cities share zip codes, but that seems a lot more probable than states shar

I only proposed getting rid of the state field, not the city. I have no idea whether cities share zip codes, but that seems a lot more probable than states sharing zip codes. And even if they did, unless that zip code also had two cities named the same, it would still be uniquely identify an address.