ResearchDataGov is a web portal and application system for discovering and requesting restricted microdata from federal statistical agencies. It was developed with support and guidance from the Census Bureau, the Office of Management and Budget, and the Interagency Council on Statistical Policy. Restricted microdata in RDG can be browsed by agencies and by titles. This tool provides guidelines for applying for restricted data. Resarchers can use the ResearchDataGov data access request system to apply for these data. ICPSR will then submit a completed application to the relevant federal agency.

https://www.icpsr.umich.edu/web/pages/appfed/index.html