Salmsach is a municipality in the district of Arbon in the canton of Thurgau in Switzerland.

In 1155 the abbey owned a farm, five Schupposen, some tithe rights and half the church treasure in Salmsach.

The Abbot of St. Gall, Ulrich Rösch, acquired Salmsach and the church treasure in 1471 and united it with the court of Romanshorn.

The Knights of the Churchyard of Arbon, who had entered into a contract in 1201 with provost and the Abbey of St. Stephen, were allowed to appoint the pastor and had other rights in the village.

The main economic activity in the village included fruit production, horticulture and agriculture, though in the 19th Century two mills opened.

While it has retained the character of a little country hamlet, it is a residential community for the nearby town of Romanshorn.

[3] Salmsach has an area, as of 2009[update], of 2.7 square kilometers (1.0 sq mi).

It consists of the village of Salmsach and the hamlets of Buerüüti, Fälwis and Hungerbüel.

[6] The age distribution, as of 2009[update], in Salmsach is; 117 children or 9.0% of the population are between 0 and 9 years old and 163 teenagers or 12.6% are between 10 and 19.

[12] In the 2007 federal election the most popular party was the SVP which received 40.85% of the vote.

In the federal election, a total of 314 votes were cast, and the voter turnout was 38.4%.

[13] The historical population is given in the following table:[3][14] As of  2007[update], Salmsach had an unemployment rate of 2.19%.

[7] From the 2000 census[update], 439 or 33.1% were Roman Catholic, while 532 or 40.1% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 14 or 48.3% are female, 8 or 27.6% are not Swiss citizens and 7 or 24.1% do not speak German natively.

The lower and upper primary levels begin at about age 5-6 and lasts for 6 years.

At the lower primary level, there are 20 children or 64.5% of the total population who are female, 6 or 19.4% are not Swiss citizens and 5 or 16.1% do not speak German natively.

In the upper primary level, there are 26 or 56.5% who are female, 13 or 28.3% are not Swiss citizens and 12 or 26.1% do not speak German natively.