About Route-Nova Zip-code - Java library

Zip-code is a library for calculating the distance between two zip codes and finding all the records with x miles (or kilometers) of another zip code. Currently, Zip-code support only PostgreSQL. Additional future support for other databases will be added in future releases of Zip-code.

Zip-code is free software released under the terms of the new BSD license. Zip-code was written in JAVA and Pl/PgSQL. It runs for testing purposes with open-source US zip code data, that available for free at http://www.populardata.com in CSV format.

The distance calculations are made by doing a great circle calculation on longitude and latitude points provided by the census data. The result is returned in kilometers or standard miles.