List of metropolitan areas by population in the context of "Slum"

The Milan metropolitan area, also known as Grande Milano ("Greater Milan"), is the largest metropolitan area in Italy and the 54th largest in the world.

Earth has a human population of over 8.2 billion as of 2025, with an overall population density of 50 people per km (130 per sq. mile). Nearly 60% of the world's population lives in Asia, with more than 2.8 billion in the countries of India and China combined. The percentage shares of China, India and rest of South Asia of the world population have remained at similar levels for the last few thousand years of recorded history.

The world's population is predominantly urban and suburban, and there has been significant migration toward cities and urban centers. The urban population jumped from 29% in 1950 to 55.3% in 2018. Interpolating from the United Nations prediction that the world will be 51.3% urban by 2010, Ron Wimberley, Libby Morris and Gregory Fulkerson estimated 23 May 2007 would have been the first time the urban population was more populous than the rural population in history. India and China are the most populous countries, as the birth rate has consistently dropped in wealthy countries and until recently remained high in poorer countries. Tokyo is the largest urban agglomeration in the world.

Incheon is a city located in northwestern South Korea, bordering Seoul and Gyeonggi Province to the east. Inhabited since the Neolithic, Incheon was home to just 4,700 people when it became an international port in 1883. As of February 2020, about 3 million people live in the city, making it South Korea's third-most-populous city after Seoul and Busan.

The city's growth has been assured in modern times with the development of its port due to its natural advantages as a coastal city and its proximity to the South Korean capital. It is part of the Seoul Metropolitan Area, along with Seoul itself and Gyeonggi Province, forming the world's fourth-largest metropolitan area by population.

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 15,701,602 at the end of 2024, hosting 18 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. Today, it forms one of the largest urban agglomerations in Europe, alongside Moscow. The city's annual population growth of 3.45 percent ranks as the highest among the seventy-eight largest metropolises in the Organisation for Economic Co-operation and Development. The high population growth mirrors an urbanization trend across the country, as the second and third fastest-growing OECD metropolises are the Turkish cities of İzmir and Ankara.

The Greater Cairo (Arabic: القاهرة الكبرى, romanized: Al-Qāhira al-Kubrā) is a metropolitan area centered around Cairo, Egypt. It comprises the entirety of the Cairo Governorate, the cities of Imbaba and Giza in the Giza Governorate, and the city Shubra El Kheima in Qalyubia Governorate. Its definition can be expanded to include peri-urban areas and a number of new planned towns founded in the desert areas east and west of Cairo. The Greater Cairo Region is also officially defined as an economic region consisting of the Cairo, Giza, and Qalyubia Governorates. Within Greater Cairo lies the largest metropolitan area in Egypt, the largest urban area in Africa, the Middle East, and the Arab world, and the 6th largest metropolitan area in the world.

In its larger definition, the area includes all cities in the Cairo Governorate (Cairo, New Cairo, Badr, Shorouk, 15th of May, the New Administrative Capital, and Capital Gardens) as well as the main cities of the Giza Governorate (Giza, 6th of October, New 6 October, October Gardens, Sheikh Zayed, and New Sphinx) and Shubra El Kheima and Obour in the Qalyubia Governorate. According to an estimate based on United Nations projections, the area had a population of 22,183,000 in 2023. In 2012, when the area's population was estimated at 20.5 million, the population density within Cairo Governorate was estimated at 45,000 per square kilometer (111,700 per square mile).

The Lima Metropolitan Area (Spanish: Área Metropolitana de Lima, also known as Lima Metropolitana) is an area formed by the conurbation of the Peruvian provinces of Lima (the nation's capital) and Callao. It is the largest of the metropolitan areas of Peru, the seventh largest in the Americas, the fourth largest in Latin America, and among the thirty largest in the world. The conurbation process started to be evident in the 1980s.

The metropolitan area is composed of five subregions. These are Lima Norte, Lima Sur, Lima Este, Central Lima, and Callao. Its estimated 2020 population is over 11 million according to the INEI.

Mumbai Metropolitan Region (ISO: Muṁbaī Mahānagara Pradēśa; abbreviated to MMR and previously also known as Greater Bombay Metropolitan Area), is a metropolitan area consisting of Mumbai (Bombay) and its satellite towns on Salsette Island and in adjacent mainland areas in the northern Konkan division of Maharashtra in western India. The region has an area of 6,328 square kilometres (2,443 sq mi) and with a population of over 26 million it is among the most populous metropolitan areas in the world.

Developing over a period of about 20 years, it consists of nine municipal corporations and eight smaller municipal councils. The entire area is overseen by the Mumbai Metropolitan Region Development Authority (MMRDA), a state-owned organisation in charge of town planning, development, transportation and housing in the region.