The North Atlantic Population Project (NAPP)

NAPP is a harmonized database of the complete censuses of Canada (1881), Great Britain (1881), Norway (1865, 1900), Sweden (1900) and the United States (1880). We will be adding six complete censuses of Iceland, the complete 1890 census of Sweden, and twenty samples from the late nineteenth and early twentieth century to the databases.

The link address is: http://nappdata.org