Seine-et-Oise department

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Paris and petite couronne . With the administrative reform of 1964–1968, the two departments of Seine and Seine-et-Oise were dissolved and 7 new departments were created in their place.

The Seine-et-Oise department was a French department . It surrounded the Seine department , which in turn surrounded the city of Paris . The prefecture was in Versailles . The department carried the ordinal number 78. Seine-et-Oise was dissolved in 1968.


The Seine-et-Oise department was founded on March 4, 1790 at the time of the French Revolution . It was named after the two rivers Seine and Oise , which cross the department. The department included a large part of the wider Paris area to the west, north and south; the strip of territory in the east of the French capital, on the other hand, was only narrow.

When it was dissolved in 1968, the department consisted of 688 suburban and rural communities and covered 5658 square kilometers. The breakdown into arrondissements was changed frequently, in 1968 there were ten: Argenteuil , Étampes , Mantes-la-Jolie , Montmorency , Palaiseau , Pontoise , Le Raincy , Rambouillet , Saint-Germain-en-Laye and Versailles .


The first census in France in 1801 showed 421,535 inhabitants for the Seine-et-Oise department. With the growth of neighboring Paris, the population of Seine-et-Oise also grew: in 1968 it was 2,943,350 and, according to the government, had reached a size that could no longer be administered. On January 1, 1968 Seine-et-Oise was (essentially) divided into the three smaller departments Yvelines (78), Val-d'Oise (95) and Essonne (91). A smaller part of the previous department was added to the also new departments of Hauts-de-Seine , Val-de-Marne and Seine-Saint-Denis .

The procedure in detail was as follows:

  • 262 municipalities in the central area of ​​Seine-et-Oise (40% of the area) were merged to form the Yvelines department with the prefecture of Versailles. The ordinal number 78, which applied to Seine-et-Oise, was adopted for Yvelines.
  • 198 municipalities in the south of Seine-et-Oise (32% of the area) were merged to form the Essonne department; the serial number 91, assigned to Essonne, was previously used by the Algiers department .
  • 185 municipalities in the north of Seine-et-Oise (22% of the area) were combined to form Val-d'Oise; the assigned ordinal number 95 was not used before.

The remaining 6% of the Seine-et-Oise department went to the Val-de-Marne (18 municipalities), Seine-Saint-Denis (16 municipalities) and Hauts-de-Seine (9 municipalities) departments.

It follows that the Yvelines, Val-d'Oise and Essonne departments together are smaller than the former Seine-et-Oise department (5658 km² compared to 5334 km²).

Grande couronne

The departments of Yvelines, Essonne, Val-d'Oise and beyond Seine-et-Marne are also known as the grande couronne , opposite the petite couronne , which extends to the departments of Hauts-de-Seine, Val-de, which are closer to Paris -Marne and Seine-Saint-Denis refers.

In the 1999 census, 4,554,426 inhabitants were counted for the territory of the former Seine-et-Oise department. That means an increase of around 1,600,000 inhabitants since 1968, as more and more people have to or want to live “in the country” near the capital but a little further outside.

Web links

Commons : Seine-et-Oise  - collection of images, videos and audio files