North Atlantic Population Project - A collaborative project coordinated by the University of Minnesota to create a harmonized database of complete-count censuses from Canada, Great Britain, Iceland, Norway and the United States from the late 19th century. The database has information on 90 million people living on the North Atlantic rim between 1865 and 1900. It is the only complete-count census microdata freely available for scholarly research, and is the basis for many comparative research projects.

Integrated Public Use Microdata Series (IPUMS) - created at the University of Minnesota, consists of twenty-five high-precision samples of the American population drawn from thirteen federal censuses. The twenty-five samples, which span the censuses of 1850 to 1990, collectively comprise the richest source of quantitative information on long-term changes in the American population.

1881 Genealogical Records - Records were put online by  Members of the Latter-Day Saints.