Trélex is a small village in the district of Nyon in the canton of Vaud in Switzerland. History Trélex is first mentioned in 1145 as Trailai. Geography Trélex has an area, , of . Of this area, or 51.9% is used for agricultural purposes, while or 34.3% is forested. Of the rest of the land, or 14.9% is settled (buildings or roads), or 0.2% is either rivers or lakes. Of the built up area, housing and buildings made up 8.3% and transportation infrastructure made up 4.3%. Power and water infrastructure as well as other special developed areas made up 2.1% of the area Out of the forested land, 33.0% of the total land area is heavily forested and 1.2% is covered with orchards or small clusters of trees. Of the agricultural land, 46.0% is used for growing crops and 4.3% is pastures, while 1.6% is used for orchards or vine crops. All the water in the municipality is in lakes. The municipality was part of the Nyon District until it was dissolved on 31 August 2006, and Trélex became part of the new district of Nyon. The municipality is located at the foot of the Jura Mountains, on the Nyon-Saint-Cergue road. Coat of arms The blazon of the municipal coat of arms is Gules, a Winnowing-basket Or. Demographics Trélex has a population () of . , 24.3% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 22.7%. It has changed at a rate of 15.4% due to migration and at a rate of 7% due to births and deaths. Most of the population () speaks French (868 or 78.0%), with German being second most common (96 or 8.6%) and English being third (93 or 8.4%). There are 16 people who speak Italian. The age distribution, , in Trélex is; 203 children or 15.1% of the population are between 0 and 9 years old and 228 teenagers or 17.0% are between 10 and 19. Of the adult population, 74 people or 5.5% of the population are between 20 and 29 years old. 160 people or 11.9% are between 30 and 39, 295 people or 21.9% are between 40 and 49, and 154 people or 11.5% are between 50 and 59. The senior population distribution is 139 people or 10.3% of the population are between 60 and 69 years