Sociometrics, http://www.socio.com
Geolytics, http://www.censuscd.com
Unicon, http://www.unicon.com
Datamocracy, http://www.datamocracy.com
Data on the Net, http://odwin.ucsd.edu/idata
Fedstats, http://www.fedstats.gov
Center for International Earth Science Information Network (CIESIN)
http://www.ciesin.org
National Archives & Records Administration, Center for Electronic Records (NARA, CER), http://www.nara.gov/nara/electronic
South African Data Archive (SADA), http://www.nrf.ac.za/sada/index.asp
Yale University Social Science Data Archive, http://statlab.stat.yale.edu/SSDA/ssda.html
Institute for Social Research (ISR), http://www.isr.umich.edu
Minnesota Population Center, http://www.pop.umn.edu