Saint-Sulpice is a municipality in Switzerland in the canton of Vaud, located in the district of Ouest Lausannois. It is a suburb of the city of Lausanne. Saint-Sulpice is first mentioned in 1228 as Sanctus Surpiscius. Saint-Sulpice has an area, , of . Of this area, or 15.1% is used for agricultural purposes, while or 7.0% is forested. Of the rest of the land, or 75.8% is settled (buildings or roads). Of the built up area, industrial buildings made up 6.5% of the total area while housing and buildings made up 41.9% and transportation infrastructure made up 11.8%. Power and water infrastructure as well as other special developed areas made up 3.2% of the area while parks, green belts and sports fields made up 12.4%. Out of the forested land, 5.4% of the total land area is heavily forested and 1.6% is covered with orchards or small clusters of trees. Of the agricultural land, 13.4% is used for growing crops and 1.1% is pastures. The municipality was part of the Morges District until it was dissolved on 31 August 2006, and Saint-Sulpice became part of the new district of Ouest Lausannois. The municipality is located along Lake Geneva between the Venoge and Chamberonne river. It consists of the village of Saint-Sulpice, the residential development of Les Pierrettes and the industrial zone of En Champigny. The blazon of the municipal coat of arms is Gules, Chief Argent, overall a Church Argent lined Sable. Saint-Sulpice has a population () of . , 27.3% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 4%. It has changed at a rate of 1.6% due to migration and at a rate of 3.1% due to births and deaths. Most of the population () speaks French (2,377 or 81.6%), with German being second most common (231 or 7.9%) and English being third (81 or 2.8%). There are 58 people who speak Italian. Of the population in the municipality 377 or about 12.9% were born in Saint-Sulpice and lived there in 2000. There were 1,015 or 34.8% who were born in the same canton, while 610 or 20.