San Isidro is a partido of Buenos Aires Province, Argentina found in the north of Greater Buenos Aires. Its capital is the city of San Isidro. It is 21 km (13 mi) from the city of Buenos Aires.The founder of San Isidro city was Domingo de Acassuso, who built a cathedral in 1706 dedicated to San Isidro Labrador, having seen him in a dream. Other towns in the municipality are Acassuso, Beccar, Boulougne, Martínez, and Villa Adelina.The area of the partido is 51.44 km2 (19.9 sq mi).