What is IPUMS? The IPUMS collection of databases at the University of Minnesota comprise the world's largest repository of census and survey microdata. IPUMS standardizes the data and harmonized variables to make research faster and simpler. In addition, IPUMS adds value to the data by constructing family interrelationship (pointer) variables, creating corresponding geographic shapefiles, and building crosswalks between data sources. Extensive documentation aids researchers in interpreting the data; documentation includes enumerator forms in the original language as well as the English versions, codebooks, etc. These databases are free-of-charge to use, and are open to researchers, policymakers, and students.