Can someone point to:
- a database that identifies adjacent postal addresses (for example, if I provide an address, the database provides address of houses on either side of house address)?
- a database that lists zoning of addresses, so as to distinguish commercial, house, and apartment buildings?
I realize it's unlikely I'll get either of this data apart form large urban centers.
This is for a web app, and my target would be major US cities. I usually use a php-javascript stack, but I can also work with python. I would prefer a free database with api access over other options, but I'm open. The idea of the web app would be to collect user addresses and then compare those addresses (say to identify a neighbor).