A simple web service with a SQL backing store to lookup ZIP codes and City/States

There are over 70,000 ZIP codes loaded in the database.

Run the database installer to create a SQL database with all location data. Gravitybox.LocationService.Install.exe

When prompted, fill in the database connection information on the "Create" tab.

Create a web site in IIS and point to the binaries for the Gravitybox.Webservice.GeoLocationService project and give the site a port binding like 8080. Change the connection string in the web.config file and the service is ready to go. In this example you would then connect to web service at "http://localhost:8080/GeoLocationService.svc"

The service has several methods that allow you to get a ZipInfo object by ZIP code, coordinate, or city/state. The generic GetLookup method will figure out what was sent in and do its best to return the best answer.

It now supports Canadian postal codes. Oh yea?