Seine-et-Oise
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Seine-et-Oise was a département of France encompassing the western, northern, and southern parts of the metropolitan area of Paris. Its préfecture (capital) was Versailles and its official number was 78. Seine-et-Oise was abolished in 1968.
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General characteristics
Seine-et-Oise was created on March 4, 1790. Its name comes from the two main rivers (Seine River and Oise River) flowing through it.
At its disappearance in 1968, Seine-et-Oise consisted of 688 suburban and rural communes surrounding the Seine département to the north, west, and south. It had an area of 5,658 km² (2,184 sq. miles). The division of Seine-et-Oise into arrondissements changed many times. At its disappearance in 1968 it had ten arrondissements: Argenteuil, Étampes, Mantes, Montmorency, Palaiseau, Pontoise, Le Raincy, Rambouillet, Saint-Germain-en-Laye, and Versailles.
Split-up
At the first French census in 1801, Seine-et-Oise had 421,535 inhabitants. 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. It was judged that Seine-et-Oise was now too large and ungovernable, and so on January 1, 1968 it was split into (essentially) three smaller départements: Yvelines, Val-d'Oise, and Essonne. A small part of Seine-et-Oise was also merged with parts of the Seine département (also disbanded on January 1, 1968) to create the three new départements of Hauts-de-Seine, Val-de-Marne, and Seine-Saint-Denis.
In detail, the splitting up of the Seine-et-Oise département was carried out like this: 262 communes in the central part of the département became the Yvelines département, with Versailles as the préfecture. The official number 78 which was used for Seine-et-Oise was given to the new Yvelines département, which is the largest chunk of the former Seine-et-Oise (40% of the area of Seine-et-Oise). 198 communes in the south of Seine-et-Oise (32% of the area of Seine-et-Oise) became the Essonne département, and the official number 91 was assigned to this département (a number previously used for the Alger département in French Algeria). 185 communes in the north of Seine-et-Oise (22% of the area of Seine-et-Oise) became the Val-d'Oise département, and the official number 95 was assigned to this département (a number never used before).
Of the remaining 6% of Seine-et-Oise, 18 communes were grouped with 29 communes of the Seine département to create the Val-de-Marne département. 16 communes of Seine-et-Oise were grouped with 24 communes of the Seine département to create the Seine-Saint-Denis département. Finally, the last 9 communes of Seine-et-Oise were grouped with 27 communes of the Seine département to create the Hauts-de-Seine département.
Thus, it should be noted that Yvelines, Val-d'Oise, and Essonne are altogether smaller than the former Seine-et-Oise département (5,658 km² for the Seine-et-Oise département vs. 5,334 km² for the three départements).
Grande couronne
The three départements of Yvelines, Essonne, and Val-d'Oise, plus the Seine-et-Marne département, are altogether known in France as the grande couronne (i.e. "large ring", as opposed to the "small ring" of the suburbs closer to Paris).
Population
At the 1999 French census, if Seine-et-Oise still existed its population would have been 4,554,426 inhabitants, the highest figure ever, as people relocate more and more from the center to the distant suburbs of the metropolitan area of Paris. Of the new départements created in 1968 out of Seine-et-Oise, Yvelines was the most populated in 1999 with 1,354,304 inhabitants. 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.fr:Seine-et-Oise