"ZIP codes were arbitrarily delineated and covered a range of neighborhood types; in most small and midsized cities, one ZIP code can cover urban, suburban and

"ZIP codes were arbitrarily delineated and covered a range of neighborhood types; in most small and midsized cities, one ZIP code can cover urban, suburban and rural neighborhoods with highly variable socioeconomic characteristics." My own ZIP code is a perfect example of this. We're in the ZIP code of Town A, but Town B is actually the closest incorporated town to us. The Town A ZIP code extends between the state line and a river, up the eastern edge of our county. That covers our large development, which has people from very poor to very wealthy, four smallish unincorporated communities that are mostly poor-to-median, an incorporated town of about 1,000 bordering Town A, and the actual Town A which is a National Historical Park and consequently is mostly shops and museums catering to tourists and actually has very few residents (about 300 out of about 13000 that live in the ZIP code).