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Background

Île-de-France (literally "Island of France"), also known as the région parisienne, "Paris Region". is one of the twenty-seven regions of France, and includes the city of Paris. It covers 12,012 square kilometers (4,638 square miles), and has its own regional council and president. It has a population of 12,005,077 as of January 2014, or 18.2 percent of the population of France.
The region is made up of eight administrative departments: Paris, Essonne, Hauts-de-Seine, Seine-Saint-Denis, Seine-et-Marne, Val-de-Marne, Val-d'Oise and Yvelines. Created as the "District of the Paris Region" in 1961, it was renamed after the historic province of Île-de-France in 1976 when its administrative status was aligned with the other French administrative regions created in 1972. Residents are sometimes referred to as "Franciliens", an administrative word created in the 1980s.
The GDP of the region in 2012 was 612.3 billion Euros, or (US$788 billion at market exchange rates). It has the highest per-capita GDP among regions in France, and the third highest of regions in the European Union. In 2014 thirty companies from the Fortune Global 500 had their headquarters in the Paris Region.
Reference: Wikipedia