Trélex is a small village in the district of Nyon in the canton of Vaud in Switzerland.

[3] Trélex has an area, as of 2009[update], of 5.8 square kilometers (2.2 sq mi).

Of the rest of the land, 0.86 km2 (0.33 sq mi) or 14.9% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.2% is either rivers or lakes.

[5] The municipality is located at the foot of the Jura Mountains, on the Nyon-Saint-Cergue road.

[9] Most of the population (as of 2000[update]) speaks French (868 or 78.0%), with German being second most common (96 or 8.6%) and English being third (93 or 8.4%).

[10] The age distribution, as of 2009[update], 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.

[9] The historical population is given in the following chart:[3][13] The local church is a distinctive landmark for visitors.

In the 2007 federal election the most popular party was the SVP which received 20.81% of the vote.

[14] A bakery, a village shop, a butcher and a post office provide essential services.

A big shopping center is located a few minutes away by car in Signy-Avenex, with an assortment of services (pharmacy, dry-cleaning, etc.)

[9] There were 552 residents of the municipality who were employed in some capacity, of which females made up 39.5% of the workforce.

In the tertiary sector; 17 or 18.7% were in wholesale or retail sales or the repair of motor vehicles, 22 or 24.2% were in the movement and storage of goods, 4 or 4.4% were in a hotel or restaurant, 9 or 9.9% were in the information industry, 11 or 12.1% were technical professionals or scientists, 12 or 13.2% were in education.

[9] From the 2000 census[update], 277 or 24.9% were Roman Catholic, while 468 or 42.0% belonged to the Swiss Reformed Church.

In the Vaud cantonal school system, two years of non-obligatory pre-school are provided by the political districts.

The canton's primary school program requires students to attend for four years.