The main purpose of this publication is to provide the producers of population and housing censuses with guidance on the use of registers and administrative data for censuses, including operational, practical, technical and legal aspects. Although various United Nations recommendation on population and housing censuses include a brief description of how registers and administrative data can be used for censuses, this is the first publication entirely dedicated to this subject. The publicationwas prepared by a task force composed of leading census experts from national statistical offices. The publication primarily targets national statistical officers and other agencies responsible for censustaking, and is also expected to be valuable for users of census results