Where are the largest metropolitan regions in the EU?

In 2023, there were 5 metropolitan regions in the EU with over 5 million people. The EU's largest metropolitan region in 2023 was Paris in France, with a population of 12.4 million people, followed by the Spanish metropolitan regions of Madrid and Barcelona with 6.9 and 5.8 million inhabitants, respectively. Berlin, with a total population of 5.5 million, and the Ruhrgebiet metropolitan region in Germany (5.1 million residents), completed the top 5.