Administrative data are information collected, used, and stored primarily for administrative (i.e., operational), rather than research, purposes. These data can be an excellent source of information for use in research and impact evaluation. Specific requirements and processes for obtaining data vary by data source. To assist researchers in screening potential data sources, J-PAL North America has cataloged a number of key US data sets. The catalog documents procedures on how to access data based on information provided by the originating agencies.