Seine-et-Oise

Seine-et-Oise (French pronunciation: [sɛn‿e waz]) is a former department of France, which encompassed the western, northern and southern parts of the metropolitan area of Paris.

For the last two decades of its existence before the preparations for its dissolution, it has five arrondissements: Corbeil, Mantes, Pontoise, Le Raincy, Rambouillet, and Versailles.

With the growth of the Paris suburbs, the population of Seine-et-Oise increased markedly, and by 1968 it had reached 2,943,350 inhabitants.

[3] At the 1999 French census, the population of the former department of Seine-et-Oise was 4,554,426 inhabitants, its highest figure ever, as people relocated more and more from the center to the distant suburbs of the metropolitan area of Paris.

Seine-Saint-Denis and Hauts-de-Seine are more populous than Yvelines, but only a small part of their territory is made up of the former Seine-et-Oise.

Map of Seine-et-Oise in France, around Seine
An old Michelin roadsign in Marines
A map showing the extent of the departments of Seine-et-Oise (brown) and Seine (dark brown) before 1968, with the current department boundaries shown in black.