The Population and Housing Census 2011 has been conceived as an operation combining:

• A pre-census file created from the maximum use of the available administrative registers, taking the Municipal Register as the basic element of its structure.
• Fieldwork that includes two large operations:
• A comprehensive Building Census that enables geo-referencing all buildings.
• A large sampling survey in order to ascertain characteristics of persons and dwellings.

The population figures have been obtained through the recount of the registers contained in the pre-census file, weighted -when it is necessary- with some recounting elements obtained from the survey.