The Integrated Public Use Microdata Series (IPUMS), (site) based at the University of Minnesota, is a group of projects for working with census data. One of these, IPUMS-International, "is a project dedicated to collecting and distributing census data from around the world. Its goals are to:

• Collect and preserve data and documentation
• Harmonize data
• Disseminate the data absolutely free!"
• Successful at masking personal information