The Priority Neighbourhoods are a new priority geography of urban policy, established by the planning law for urban affairs and urban cohesion of 21 February 2014. The list and the shapes of these neighbourhoods have been defined by the General Commission for Territorial Equality (CGET). In metropolitan France and for Reunion Island and Martinique, the method was based on concentrations of low-income populations. These data were statistics geographically referenced to a system of squared grid cells, 200 m side. On the other overseas territories of France, the priority neighbourhoods were defined using mostly identical socio-demographic indicators at the level of sub-communal divisions. Once these neighbourhoods defined, collectivities have discussed their shape, and sometimes, modified them. The priority neighbourhoods are defined by the decree n° 2014-1750 of December 30th 2014 for the metropolitan France and by the decree n° 2014-1751 of December 30th 2014 for overseas territories of France, modified by the decree n° 2015-1138 of September 14th 2015.
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