IPUMS - International (Integrated Public Use Microdata Series - International) is the world's largest collection of publicly available individual-level census data. The data are samples from population censuses from around the world taken since 1960. Names and other identifying information have been removed. The variables have been given consistent codes and have been documented to enable cross-national and cross-temporal comparisons. Registration is required: users must submit an abstract of the research project when registering for IPUMs - International for approval.