Frankfurt is a metropolis and the largest city of the German state of Hesse. Its inhabitants make it the fifth-largest city in Germany. On the River Main, it forms a continuous conurbation with the neighbouring city of Offenbach am Main and its urban area has a population of 2.3 million. In terms of area coverage, it is the largest city in the state of Hesse. Frankfurt is a global leading financial center. The city is at the centre of the larger Rhine-Main Metropolitan Region, which has a population of 5.5 million and is Germany’s second-largest metropolitan region after the Rhine-Ruhr Region. Between the 2013 enlargement of the European Union and the United Kingdom’s withdrawal in 2020, the geographic centre of the EU was about 40 km to the east of Frankfurt’s central business district. Like France and Franconia, the city is named after the Franks. Frankfurt is the largest city in the Rhine Franconian dialect area.
Frankfurt was a city state, the Free City of Frankfurt, for nearly five centuries and was one of the most important cities of the Holy Roman Empire, as a site of imperial coronations; it lost its sovereignty upon the collapse of the empire in 1806, regained it in 1815 and then lost it again in 1866, when it was annexed (though neutral) by the Kingdom of Prussia. European Central Bank, Deutsche Bank, German Federal bank and other big financial bodies are located in this city. There is also one of the busiest airports in the world, the Airport of Frankfurt, which is one of the biggest employers in this region. It has been part of the state of Hesse since 1945. Frankfurt is culturally, ethnically and religiously diverse, with half of its population, and a majority of its young people, having a migration background. A quarter of the population consists of foreign nationals, including many expatriates.