The North Atlantic Population Project (NAPP) harmonizes and disseminates nineteenth and early twentieth century census microdata. Most of the datasets cover entire national populations. The collection includes data from Canada, Denmark, Great Britain, Germany, Iceland, Norway, Sweden, and the United States for the period 1703 to 1911. The project is a collaboration between IPUMS and various academics and National Archives.

NOTE: NAPP datasets are now disseminated through the IPUMS International data system. Users must register there to gain access. Please contact if you have questions or encounter difficulties.

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What is IPUMS?

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 context. Data and services available free of charge.