Piraeus of social problems also emerged with the concentration of new populations in the suburbs of the old city, such as Nikaia, Keratsini, Drapetsona and Korydallos. The involvement of Greece in World War II came as a major setback to the city's progress. After the war, the city began its development once more, as damage to the port and the city were repaired and new additions took shape after 1955. Piraeus is now the third largest municipality in Greece; the city proper with its suburbs form the Piraeus urban area, which is incorporated in the Athens urban area, thus making Piraeus
Piraeus Bank (today Piraeus Bank Beograd with 42 branches), and the Egyptian Commercial Bank (today Piraeus Bank Egypt with 43). In 2007 PB purchased the Cyprus arm of Arab Bank and renamed it Piraeus Bank (Cyprus). On 13 September 2007 Piraeus Bank completed its acquisition of 99.6% of the share capital of "International Commercial Bank" in Ukraine, today named Piraeus ICB. In June 2012 PB signed an agreement with Investors Bancorp Inc, to transfer PB's shareholding in Marathon Banking Corporation in New York City, to Investors Bancorp. PB used the money it received for Marathon to finance the take over of the