db¶

The dataset for uszipcode is from multiple source, and integrated by Sanhe Hu.

2012-01-22 federal governmanet zipcode data from http://federalgovernmentzipcodes.us/
2010 zcta2010 population, wage, houseunit, land, water area data from from http://proximityone.com/cen2010_zcta_dp.htm
2015-10-01 geometry google map geocoding data from http://maps.google.com