Lainville-en-Vexin

Montalet-le-Bois (French pronunciation: [mɔ̃talɛ lə bwa]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Sailly (French pronunciation: [saji]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Brueil-en-Vexin (French pronunciation: [bʁyɛj ɑ̃ vɛksɛ̃], literally Brueil in Vexin) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Château de Jambville is a French castle located in the town of Jambville in the Yvelines department, 50 km northwest of Paris. The castle was built between the 15th century and the 18th century on the foundations of a medieval castle. The lordship was granted to the steward Antoine Le Camus de Jambville in 1650. It passed in 1769 to the Marquis Charles-Claude-François du Tillet, colonel in the Royal Regiment, and to the stewardship of Étienne Thomas de Maussion in 1775. It was sold as national property in 1793. Baron Antoine Adolphe Thomas Maussion became the owner in 1816. in 1904, it was acquired by Paul Fould (1837-1917), master of requests to the Council of State. It has hosted the National Scout Training Centre of the Scouts et Guides de France since 1952.

The Centre national de formation des Scouts et Guides de France (National Training Centre of the Scouts and Guides of France) is located in Jambville, France. Each year, more than 2,000 people attend the courses. With 27 meeting rooms, 200 beds in rooms or dormitories and a dining hall with 400 seats, the center has the necessary infrastructure to accommodate many people. The garden of the castle, built in the 18th century, covers nearly 52 hectares, half meadow and half forest. Every two years, it hosts the meeting of the young Christians of Île-de-France, the FRAT.

Jambville (French pronunciation: [ʒɑ̃bvil]) is a commune in the Yvelines department in the Île-de-France region in north-central France. It is 50 kilometres to the north west of Paris in the heart of the Vexin national park. Château de Jambville is the Centre national de formation des Scouts et Guides de France (National Training Centre for Scouts and Guides of France). The chateau dates from the 16th to the 19th Century.

Arthies (French pronunciation: [aʁ.ti] ) is a commune in the Val-d'Oise department in Île-de-France in northern France. It is located in the regional nature park of Vexin.

Aincourt (French pronunciation: [ɛ̃kuʁ] ) is a commune in the Val-d'Oise department in Île-de-France in northern France. It is located in the regional nature park of Vexin.

Oinville-sur-Montcient (French pronunciation: [wɛ̃vil syʁ mɔ̃sjɑ̃]) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Wy-dit-Joli-Village is a commune in the Val-d'Oise department and Île-de-France region of France.

Frémainville (French pronunciation: [fʁemɛ̃vil] ) is a commune in the Val-d'Oise department in Île-de-France in northern France.

Gadancourt (French pronunciation: [ɡadɑ̃kuʁ] ) is a former commune in the Val-d'Oise department in Île-de-France in northern France. On 1 January 2018, it was merged into the commune of Avernes.