Glenn Johnson Technical Training Here is a collection of Zip Code functions.

I use this Web Service as an example in the courses that I teach. It should be up all of the time, so feel free to use it. If you are interested, the data is available from http://www.zipcodedatabase.com. If you decide to get the Zip Code Database from zipcodedatabase.com, they also provide the formulas to do all of the calculations (in Access DB). If you want an optimized SQL Server database structure (no data, just schema and functions and stored procedures) and the Web Service source code, I sell it for $395.00. Be sure to visit GJTT.com for additional .NET support. Feel free to email me. if any questions.

Author of ASP.Net in 60 Minutes a Day

The following operations are supported. For a formal definition, please review the Service Description.

• GetCoordinate
  Returns the coordinate in latitute and longitude for a given zip code
• GetDistance
  Returns the decimal distance between two zip codes
• GetLocation
  Returns a DataSet with all locations that have a given zip code
• GetNearbyLocations
  Returns a DataSet containing all locations within a given radius of a zip code
• GetNearbyZipCodes
  Returns a DataSet containing maximum of 250 zip codes and radius milage within a given radius of a zip code
• GetNearbyZipCodesWhereClause
  Returns a string Where clause containing maximum of 250 zip codes within a given radius of a zip code