Trey is a municipality in the district of Broye-Vully in the canton of Vaud in Switzerland.

[3] Trey has an area, as of 2009[update], of 3.8 square kilometers (1.5 sq mi).

Of the rest of the land, 0.36 km2 (0.14 sq mi) or 9.4% is settled (buildings or roads), 0.05 km2 (12 acres) or 1.3% is either rivers or lakes.

The blazon of the municipal coat of arms is Per pale Argent and Gules, a chevron between three shells two and one counterchanged.

[10] The age distribution, as of 2009[update], in Trey is; 35 children or 14.0% of the population are between 0 and 9 years old and 31 teenagers or 12.4% are between 10 and 19.

[9] The historical population is given in the following chart:[3][13] The entire village of Trey is designated as part of the Inventory of Swiss Heritage Sites.

[14] In the 2007 federal election the most popular party was the FDP which received 34.15% of the vote.

[9] There were 102 residents of the municipality who were employed in some capacity, of which females made up 46.1% of the workforce.

In the tertiary sector; 1 was in the movement and storage of goods, 2 or 28.6% were in a hotel or restaurant, 1 was a technical professional or scientist, 4 or 57.1% were in education.

[9] From the 2000 census[update], 32 or 13.8% were Roman Catholic, while 175 or 75.4% 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.