Val-d'Oise

Val-d'Oise (French:; lit. 'Vale of Oise') is a department in the Île-de-Franceregion, Northern France. It was created in 1968 following the split of the Seine-et-Oise department. In 2023, Val-d'Oise had a population of 1,281,653.

It is named after the river Oise, a major tributary of the Seine, which crosses the region after having started in Belgium and flowed through Northeastern France. Val-d'Oise is Île-de-France's northernmost department. Charles de Gaulle Airport, France's main international airport, is partially located in Roissy-en-France, a commune of Val-d'Oise.

Its INSEE and postcode number is 95.