Zipwise

Get the raw data now. This is the actual data from the U.S. Postal Service, but for a tiny fraction of the cost.

Includes data in the following formats: Excel format (.xls) Text file (.csv) Includes the following fields: Zip Code Latitude Longitude County City State Time Zone Also includes an easy-to-follow instructive document, "Calculating Distance," which precisely describes the calculations and methodology behind calculating the distance between zip codes.
What's new in this version:
Updated data for 2005