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

Roggwil is first mentioned in 854 as Megenberti de Rocconwilare when it became part of the holdings of the Bishop of Constance.

In 1264, the low justice rights over Hagenwil and Roggwil went to the Abbey of St. Gall.

Around 1420, Mötteli von Rappenstein bought the tower, which he expanded to a castle.

In 1578, the castle was inherited by Studer von Winkelbach, in 1650 it passed on to the Bernhausens, and from 1740 to 1805 it was in possession of the monastery.

In the second third of the 19th Century there were the two primary school districts, Roggwil and Freidorf-Watt in the village.

Roggwil has an area, as of 2009[update], of 12.04 square kilometers (4.65 sq mi).

It consists of the villages of Ober- and Unter-Roggwil which grew together and a number of hamletsincluding Mammertshofen.

[6] The age distribution, as of 2009[update], in Roggwil is; 387 children or 13.5% of the population are between 0 and 9 years old and 379 teenagers or 13.2% are between 10 and 19.

[11] In the 2007 federal election the most popular party was the SVP which received 47.51% of the vote.

[12] The historical population is given in the following table:[3] The Gasthof Traube, and Mammertshofen Castle are listed as Swiss heritage site of national significance.

[7] Local industry includes the shoe manufacturer kybun Corporation of Karl Müller, pharmaceutical firm A. Vogel, and a small brewery, Huus-Braui.

From the 2000 census[update], 929 or 37.7% were Roman Catholic, while 1,220 or 49.6% belonged to the Swiss Reformed Church.

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

At the lower primary level, there are 24 children or 53.3% of the total population who are female.