Licensing Information
There is no formal license for use, modification, derived works, etc. These zipcode database(s) are "free data". However, we reserve all rights to resale of the database or substaintial portions fo the database as a zipcode database or zipcode lookup service.
Attribution is appreciated.
Prefered citation:
Coven, D. S., (2012). Free Zipcode Database: Unique Zipcode [data file]. Retrieved from http://federalgovernmentzipcodes.usor
Coven, D. S., (2012). Free Zipcode Database: All Locations [data file]. Retrieved from http://federalgovernmentzipcodes.us