The nonspecific term "Grande São Paulo" ("Greater São Paulo") denotes any of São Paulo's metropolitan area definitions. The legally defined Região Metropolitana de São Paulo consists of 39 municipalities in total, and a population of more than 19 million inhabitants (as of 2005, according to IBGE).
Because São Paulo is sprawling like Los Angeles, it has another definition for its metropolitan area. Analogous to the US's CSA (Combined Statistical Area) type definition of metropolitan area, it is the third largest city in the world with 27 million inhabitants (Complexo Metropolitano Expandido), behind Tokyo and Jakarta, which includes 2 contiguous legally defined metropolitan regions, and 3 microregions.