Amriswil (Low Alemannic: Amerschwiil) is a town and a municipality in Arbon District in the canton of Thurgau in Switzerland near the Lake Constance.

Since 1710, the Reformed pastor lived in Amriswil, and it was united with Sommeri in a common parish.

The introduction of cattle (1833), a monthly market (1840), the establishment of a dairy in Sommeri (1852), the emergence of large scale weaving and the opening of a knitting factory through the German refugee Joseph Sallmann (1849) were the beginning of a structural change.

The town center shifted from the previous settlement nuclei around the market and the road intersection in Köpplishaus toward the northeast.

The rapid industrialization, however, can not be satisfactorily explained by the modest amounts of hydropower available or through the increased traffic.

[3] The companies Sallmann, Laib, and Tuchschmid were a center of manufacturing, known as the Trikoterie.

The Trikoterie remained a keystone of the local economy until around 1980, when the various companies had to close down.

[4] The municipality is located in Arbon District, at the crossing of the Winterthur-Arbon and Constance-St. Gallen roads.

It consists of the village of Amriswil and the hamlets of Biessenhofen, Oberaach, Schocherswil and Räuchlisberg.

[7] The age distribution, as of 2009[update], in Amriswil is; 1,207 children or 10.1% of the population are between 0 and 9 years old and 1,540 teenagers or 12.9% are between 10 and 19.

[12] In the 2007 federal election the most popular party was the SVP which received 40.9% of the vote.

[13] The historical population is given in the following table:[3] The Bohlenständerhaus Schrofen, Sallmann Carriage Collection and Hagenwil Castle are listed as Swiss heritage site of national significance.

The village of Hagenwil bei Amriswil is part of the Inventory of Swiss Heritage Sites.

[8] From the 2000 census[update], 4,084 or 36.0% were Roman Catholic, while 4,090 or 36.0% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 157 or 49.1% are female, 103 or 32.2% are not Swiss citizens and 96 or 30.0% 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 240 children or 52.4% of the total population who are female, 123 or 26.9% are not Swiss citizens and 146 or 31.9% do not speak German natively.

In the upper primary level, there are 228 or 47.7% who are female, 146 or 30.5% are not Swiss citizens and 172 or 36.0% do not speak German natively.

There are 280 teenagers who are in the advanced school, of which 149 or 53.2% are female, 44 or 15.7% are not Swiss citizens and 53 or 18.9% do not speak German natively.

There are 240 teenagers who are in the standard school, of which 114 or 47.5% are female, 104 or 43.3% are not Swiss citizens and 112 or 46.7% do not speak German natively.

Finally, there are 18 teenagers who are in special or remedial classes, of which 9 or 50.0% are female, 15 or 83.3% are not Swiss citizens and 15 or 83.3% do not speak German natively.