Frankfurt am Main, commonly referred to as Frankfurt, is the most populous city in the German state of Hesse. As of 2025, it has a population of 778,589 inhabitants, making it the fifth-most populous city in Germany. The city is situated in the foreland of the Taunus on the river Main and forms a continuous conurbation with Offenbach am Main.
The urban area of Frankfurt has a population exceeding 2.7 million people. It serves as the heart of the Rhine-Main metropolitan region, which is Germany's second-largest metropolitan region after the Rhine-Ruhr region. The city is classified by the GaWC as an Alpha-rated world city and hosts one of the four institutional seats of the European Union, specifically housing the European Central Bank.