U.S. Census Bureau (and other) data! For more details please see the center website: http://web.sas.upenn.edu/pfsrdc/
The University of Pennsylvania has become a founding member of a consortium to establish, in partnership with the Census Bureau, a Federal Statistical Research Data Center (FSRDC) in Philadelphia.
Through this FSRDC, Penn faculty and students will be able to conduct statistical analysis of a wide range of non-public microdata collected by the U.S. Census Bureau and other government agencies. These datasets are among the largest and most important sources of statistical information in the US and many of them can only be accessed through a FSRDC. They represent a vital resource for researchers in economics, business, demography, sociology, medicine, statistics, criminology, and many other disciplines.
The Philadelphia FSRDC is scheduled to begin operations in May 2017. It can only be used by researchers with approved projects and the approval process typically takes at least six months [emphasis added]. Interested researchers are encouraged to start working on the proposals well in advance.
Please let firstname.lastname@example.org if you have any questions!