From a statistical point of view, in Spain, a singular population entity (in Spanish:entidad singular de población)[1] is defined as "any inhabited area within a municipality, inhabited or exceptionally uninhabited, clearly differentiated within that municipality and that is known by a specific name that identifies it without the possibility of confusion", according to the definition of the National Statistics Institute.[2][3]
Population entities
The gazetteer published by the INE, usually on the dates when the population census was carried out, distinguishes, within each municipality, the following population entities, each of which has a delimited territorial scope.
Collective population entity (in Spanish: Entidad colectiva de población): a grouping of two or more singular population entities.
Singular population entity (in Spanish: Entidad singular de población): any inhabited area of a municipality, inhabited or exceptionally uninhabited, clearly differentiated within the municipality and known by a specific denomination that identifies it without the possibility of confusion.[3]
Population nucleus (in Spanish: Núcleo de población): is a group of at least ten buildings that form streets, squares and other urban roads. By exception, the number of buildings may be less than 10, as long as the population that inhabits them exceeds 50 inhabitants. The nucleus includes those buildings that, being isolated, are less than 200 meters from the outer limits of the aforementioned complex, although in determining this distance, land occupied by industrial or commercial facilities, parks, gardens, sports areas, cemeteries, parking lots and others, as well as canals or rivers that may be crossed by bridges, must be excluded.
Scattered (in Spanish: Diseminados): These are buildings -inhabited or not- that do not meet the conditions established to form a population nucleus.
The singular population entity can be constituted by several population nuclei, in addition to scattered.[4] If there is no population nucleus within the singular population entity, it is formed by the existing scattered areas in its territory.
Each singular population entity has a category that is the qualification granted, or traditionally recognized, such as city, town, lugar or village, and in the absence thereof, the one that responds to its origin and characteristics, such as baserri, settlement, barrio, monastery, tourist center, residential area, urbanization and others.
The codes were re-established in 1991 following the alphabetical order of the population nucleus within each singular entity. Newly created entities are assigned a code correlative to the last existing one, and those that disappear are not reused. The municipalities must review, at least once a year, the list of entidades and population nuclei and send it to the National Statistics Institute, which publishes it annually.