Urban unit according to INSEE

The concept of urban unity is based on the continuity of the building and the number of inhabitants. An urban unit is a municipality or group of municipalities with a continuous built-up 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 called 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.

城市单元（urban unity）的概念以建筑连续性与居住人口规模为判定基础。城市单元指拥有连续建成区（两栋建筑间的间隙不超过200米）且居住人口至少2000人的单个市镇或多个市镇的集合。若该城市单元仅位于单个市镇范围内，则称其为孤立城市（isolated city）；若城市单元跨越多个市镇，且每个相关市镇均有超过半数的人口集中于该连续建成区内，则称其为多市镇集聚区（multi-communal agglomeration）。