 The territory has an area of 2.3 square kilometer and is distributed on land that has an altitude of between 189 m and 201 m above sea level.According to the seismic hazard, the municipality is in zone 4 (irrelevant seismicity), as established by PCM ordinance 3274 of 20/03/2003.The urban fabric of San Giorgio su Legnano has developed around the old town.