Lagos is the largest city in Nigeria and one of the fastest growing cities in the world. It is located in the southwestern part of the country, on the Atlantic coast. Lagos is not only Nigeria's largest city but also its main economic, transportation, and cultural hub. Since its establishment, Lagos has been a beacon for migrants, influencing other cities around Nigeria and Africa. It is famous for its lively markets, vibrant music scene, and diverse architecture, both colonial and modern. Some of its most well-known landmarks include the National Theatre, Tafawa Balewa Square, and the Third Mainland Bridge.

Nigeria conducts a national census every 10 years, with the last one held in 2006. The next census is scheduled for 2026. According to the 2006 census, Lagos had a population of 7,682,953, but current estimates put the city's population at over 14 million, making it the most populous city in Nigeria and one of the largest in Africa. Lagos is also one of the most diverse cities in Nigeria, with residents from all over the country and beyond. The city is a melting pot of various ethnic groups, with the Yoruba being the dominant group. Other significant ethnic groups include the Igbo, Hausa, and Efik. Regarding religion, Lagos is predominantly Christian, but there is also a substantial Muslim population. English is the official language, but over 250 indigenous languages are spoken.

Lagos is administered by the Lagos State Government, with the Governor as the head of government. The city is divided into 20 Local Government Areas (LGAs), each governed by a Local Government Council consisting of an elected Chairman and Councilors. The Lagos State Government is responsible for state-wide matters, including infrastructure, health, and economic policy, while the Local Government Councils handle local affairs such as primary education, agricultural extension services, and health care facilities. Lagos also has a House of Assembly responsible for making laws for the smooth running of the state.

Lagos is the economic heartbeat of Nigeria, contributing a significant portion of the country's GDP. The city is a major center for trade and commerce, with a vibrant economy that includes industries such as finance, transportation, real estate, and entertainment. Lagos is home to the Nigerian Stock Exchange and many multinational corporations. The city's GDP is estimated at over $136 billion, which is larger than that of several African countries. The Port of Lagos is one of the busiest in Africa, handling millions of tons of cargo annually.

Lagos has an extensive infrastructure network that includes transportation, utilities, and digital connectivity. The city's transportation system includes roads, rail, air, and sea. The Lagos State Government has taken steps to improve the city's infrastructure to support its growing population and economy, with projects such as the Lagos Rail Mass Transit and the Eko Atlantic city development. However, challenges remain, particularly in areas such as traffic management and waste disposal. Digital connectivity is also a priority, with efforts being made to enhance the city's broadband infrastructure to support the growing tech industry.