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Île-de-France is densely populated and retains a prime economic position on the national stage: though it covers only 12,012 square kilometres 4,638 square miles , about 2% of , its estimated 2020 population of 12,278,210 was nearly one-fifth of the national total; its economy accounts for nearly one-third of the French.

The nuclear power industry, with its major firm , has its headquarters in Île-de-France, as does the main French oil company , the top French company in the Fortune Global 500, and the main electric utility,..

The top tourist attraction in the region in 2017 was , which received 14.

Financial services and insurance are important sectors of the regional economy; the major French banks and insurance companies, including , , and , all have their headquarters in the region.

Other major sectors of the regional economy include energy companies , , , and.

As the Frankish domination of Gaul began, there was a gradual immigration by the to Paris and the Parisian dialects were born.

It was created as the "District of the Paris Region" in 1961.

The major rivers are navigable, and, because of the modest variations of altitude in the region between 10 and 200 meters , they have a tendency to meander and curve.