Penthaz is a municipality in the district of Gros-de-Vaud in the canton of Vaud in Switzerland.

[3] Penthaz has an area, as of 2009[update], of 3.83 square kilometers (1.48 sq mi).

[5] The municipality is located on the left bank of the Venoge river.

The blazon of the municipal coat of arms is Azure, a Bend wavy Argent, overall a Column Or.

[9] Most of the population (as of 2000[update]) speaks French (1,150 or 89.4%), with German being second most common (49 or 3.8%) and Italian being third (32 or 2.5%).

[8] The age distribution, as of 2009[update], in Penthaz is; 172 children or 11.6% of the population are between 0 and 9 years old and 189 teenagers or 12.8% are between 10 and 19.

[14] In the 2007 federal election the most popular party was the SVP which received 25.45% of the vote.

In the federal election, a total of 352 votes were cast, and the voter turnout was 39.7%.

[9] There were 726 residents of the municipality who were employed in some capacity, of which females made up 42.4% of the workforce.

In 2008[update] the total number of full-time equivalent jobs was 283.

In the tertiary sector; 44 or 34.9% were in wholesale or retail sales or the repair of motor vehicles, 2 or 1.6% were in the movement and storage of goods, 5 or 4.0% were in a hotel or restaurant, 3 or 2.4% were in the information industry, 28 or 22.2% were technical professionals or scientists, 12 or 9.5% were in education and 10 or 7.9% were in health care.

[9] From the 2000 census[update], 406 or 31.5% were Roman Catholic, while 634 or 49.3% 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.

[18] During the school year, the political district provided pre-school care for a total of 296 children of which 96 children (32.4%) received subsidized pre-school care.

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

It was open a total of 240 days with average of 30 hours per week during that year.