Vionnaz is a municipality in the district of Monthey in the canton of Valais in Switzerland.

Vionnaz has an area, as of 2009[update], of 20.9 square kilometers (8.1 sq mi).

[3] The blazon of the municipal coat of arms is Quartered, Argent two bends Azure and Gules a Buck saliant Or.

[7] Most of the population (as of 2000[update]) speaks French (1,444 or 92.4%) as their first language, German is the second most common (56 or 3.6%) and Portuguese is the third (21 or 1.3%).

[7] The historical population is given in the following chart:[11] The entire village of Vionnaz is designated as part of the Inventory of Swiss Heritage Sites.

[12] In the 2007 federal election the most popular party was the CVP which received 42.62% of the vote.

[14] In the 2007 Swiss Council of States election a total of 671 votes were cast, of which 58 or about 8.6% were invalid.

[7] There were 753 residents of the municipality who were employed in some capacity, of which females made up 39.2% of the workforce.

In the tertiary sector; 71 or 32.4% were in wholesale or retail sales or the repair of motor vehicles, 17 or 7.8% were in the movement and storage of goods, 34 or 15.5% were in a hotel or restaurant, 5 or 2.3% were in the information industry, 11 or 5.0% were the insurance or financial industry, 6 or 2.7% were technical professionals or scientists, 32 or 14.6% were in education and 7 or 3.2% were in health care.

[7] From the 2000 census[update], 1,170 or 74.9% were Roman Catholic, while 217 or 13.9% belonged to the Swiss Reformed Church.

The library has (as of 2008[update]) 11,481 books or other media, and loaned out 13,851 items in the same year.

It was open a total of 124 days with average of 9 hours per week during that year.