Censuses provide population numbers, household or family size and composition, and information on sex and age distribution. They often include other demographic, economic and health-related topics as well. The 1990 Switzerland de facto census, known alternately as Eidgenössische Volkszählung and Recensement fédéral de la population, collected data through face-to-face interviews and self-enumeration on the subjects of housing, household demographics, employment, and education. Respondents filled out person, household, and building questionnaires. The census day was December 4, 1990 with fieldwork occurring November 23 - December 31. A 5% sample of households from the census (342,797 individuals) is available through IPUMS International at the University of Minnesota. Refer to the IPUMS website for guidelines on citing database versions.