U.S. and International Microdata

• ICPSR: a large data repository for the social sciences. Focuses on U.S. topics, but international and Canadian datasets are also included.
• IPUMS: provides census and survey data from around the world integrated across time and space. IPUMS integration and documentation makes it easy to study change, conduct comparative research, merge information across data types, and analyze individuals within family and community contexts.
• GESIS (Leibniz Institute for Social Sciences): Major European social sciences research institute. Datasets are available on a variety of socio-economic topics of European and international interest.