sentences:  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.Part of Pilar Partido initially, the town was renamed San Miguel after the former district was subdivided shortly afterward.