A census is a way of getting information about every member of a population. It is usually used for a population of people, but can be used to mean a population of animals. Both the United States and United Kingdom have a census every 10 years, or decade. But in Australia, Canada, Japan and New Zealand they have it every 5 years.
- "OUTLINE OF THE 2015 POPULATION CENSUS OF JAPA" (PDF). Statistics Bureau, Ministry of Internal Affairs and Communications of Japan.
- Statistics Bureau of Japan - Official website