The concept of urban unity is based on the continuity of the building and the number of inhabitants. Urban units are built in metropolitan France and in the overseas departments according to the following definition: a municipality or group of municipalities with a continuous building area (no cut-off of more than 200 metres between two buildings) with at least 2,000 inhabitants.
If the urban unit is located in a single municipality, it is referred to as an isolated city.
If the urban unit extends over several municipalities, and each of these municipalities concentrates more than half of its population in the continuous built-up area, it is referred to as a multi-communal agglomeration.
Urban units 2020 replace urban units 2010.
Urban units are redefined periodically. The current zoning, dated 2020, is established with reference to the population known in the 2017 census and the administrative geography of the territory as of 1 January 2020.
The previous fiscal year, dated 2010, was based on the 2007 census and the administrative geography of the territory as of 1 January 2010.
Source: https://www.insee.fr/fr/information/4802589
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