Mexico City (in Spanish: Ciudad de México, D.F., Distrito Federal, or México is the capital city of Mexico. It is the most important economic, industrial, and cultural center in the country; the most populous city with over 8,836,045 inhabitants in 2008.

Greater Mexico City (Zona Metropolitana del Valle de México) incorporates 59 adjacent municipalities of Mexico State and 29 municipalities of the state of Hidalgo, according to the most recent definition agreed upon by the federal and state governments.Greater Mexico City has a population exceeding 22 million people, making it the largest metropolitan area in the western hemisphere and the second largest in the world by population according to the United Nations and other organizations.

In 2005, it ranked the eighth in terms of GDP (PPP) among urban agglomerations in the world. Aside from São Paulo it is the only Beta global city with 8 points in Latin America and ranked 25th among global cities by Foreign Policy's 2008 Global Cities Index.