page_title: Demographics of Istanbul
section_title: Religious groups
hierarchical_section_title: Demographics of Istanbul / Religious groups
caption_attribution_description: English: Greek-Orthodox population of Istanbul (former Constantinople) 1844-1997
context_page_description: Throughout most of its history, Istanbul has ranked among the largest cities in the world. By 500 CE, Constantinople had somewhere between 400,000 and 500,000 people, edging out its predecessor, Rome, for world's largest city. Constantinople jostled with other major historical cities, such as Baghdad, Chang'an, Kaifeng and Merv for the position of world's most populous city until the 12th century. It never returned to being the world's largest, but remained Europe's largest city from 1500 to 1750, when it was surpassed by London.
  The Turkish Statistical Institute estimates that the population of Istanbul Metropolitan Municipality was 14,377,019 at the end of 2014, hosting 19 percent of the country's population. Then about 97–98% of the inhabitants of the metropolitan municipality were within city limits, up from 89% in 2007 and 61% in 1980. 64.9% of the residents live on the European side and 35.1% on the Asian side. While the city ranks as the world's 5th-largest city proper, it drops to the 24th place as an urban area and to the 18th place as a metro area because the city limits are roughly equivalent to the agglomeration.
context_section_description: Istanbul has been a cosmopolitan city throughout much of its history, but it has become more homogenized since the end of the Ottoman Empire. The vast majority of people across Turkey, and in Istanbul, are Muslim, and more specifically members of the Sunni branch of Islam. Most Sunni Turks follow the Hanafi school of Islamic thought, while Sunni Kurds tend to follow the Shafi'i school. The largest non-Sunni Muslim group, accounting 10-20% of Turkey's population, are the Alevis; a third of all Alevis in the country live in Istanbul. Mystic movements, like Sufism, were officially banned after the establishment of the Turkish Republic, but they still boast numerous followers. Istanbul is a migrant city. Since the 1950s, Istanbul's population has increased from 1 million to about 10 million residents. Almost 200,000 new immigrants, many of them from Turkey's own villages, continue to arrive each year. As a result, the city constant change, constantly reshaped to achieve the needs of these new population.
  The Patriarch of Constantinople has been designated Ecumenical Patriarch since the sixth century, and has come to be regarded as the leader of the world's 300 million Orthodox Christians. Since 1601, the Patriarchate has been based in Istanbul's Church of St. George. Into the 19th century, the Christians of Istanbul tended to be either Greek Orthodox, members of the Armenian Apostolic Church or Catholic Levantines.
  Eldem Edhem, in his entry on "Istanbul" in the Encyclopedia of the Ottoman Empire, wrote that about 50% of the residents of the city were Muslim at the turn of the 20th Century.
caption: Greek population in Istanbul and percentages of the city population (1844–1997). The 1923 population exchange between Greece and Turkey, the 1942 wealth tax, and the Istanbul pogrom in 1955 contributed to the sharp decrease of the Greek community.
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