Census Project http://www.rootsweb.com/~usgenweb/census/

Genealogy project attempting to put the index to the names census online, only partially complete. Also contains guides to historic municipal and church records.

Guide to using the Census
University of Michigan: http://guides.lib.umich.edu/census

Inter-University Consortium for Political and Social Research (ICPSR) http://www.icpsr.umich.edu/
provides access to a vast archive of social science data for research. ICPSR supplies data files for use with statistical software, such as SAS, SPSS, and Stata. Please note that ICPSR does not provide publications, reports, or ready-made statistics. What we do supply are the numeric raw data used to create publications, reports, and figures. To view findings that others have published, select the "related literature" link for a given data set on the search results page or at the top of each study description.