San Miguel is a city in the northwest region of Greater Buenos Aires, 30 km from the City of Buenos Aires. San Miguel is the county seat of San Miguel Partido, and has been a part of Greater Buenos Aires since the early 2000s. The number of inhabitants was 157,532 according to the 2001 census. Part of a vast estancia estate owned by General Ángel Pacheco, San Miguel was founded as San José del Pilar by a French Argentine agronomist, Adolfo Sourdeaux, on May 18, 1864.