IPUMS, originally the Integrated Public Use Microdata Series,[1] is the world's largest individual-level population database.
The records are converted into a consistent format and made available to researchers through a web-based data dissemination and analysis system.
[4] IPUMS provides consistent variable names, coding schemes, and documentation across all the samples, facilitating the analysis of long-term change.
Comprehensive documentation is provided in a coherent form to facilitate comparative analyses of social and economic change.
[7] Additional databases in the IPUMS family include the: The Journal of American History described the effort as "One of the great archival projects of the past two decades.