What is free? And what is not?

Current ESRI Data (2009) is not free. Zip Code shapefiles are not free.

Who are we?

Primary Data Source is a product developed by New Urban Research, Inc. (www.urban-research.info).

Is there more information available in terms of the methodology for these variables?

The only methodology available for ESRI data is here. ESRI variables are based on Census variables and definitions. A glossary of Census variables is here.

How do I contact someone at PDS?

Contact us here.