Mammern is a municipality in Frauenfeld District in the canton of Thurgau, Switzerland, on Lake Constance.

The modern village of Mammern is first mentioned in 909 as Manburron, when it was acquired by St. Gallen Abbey.

They were sold several times in the following century, until 1621 when Johann Friedrich Thumb gave the Herrschaft to the von Roll brothers who rebuilt the castle.

In 1667 the Herrschaft was acquired by Wolf Rudolf Reding, who sold it in 1687 to Rheinau Abbey.

St. Gallen Abbey supported the Counter-Reformation through the investiture of Catholic judges.

In 1749 the abbot of Rheinau Abbey, Bernhard Rusconi, built a baroque chapel near the castle.

Other occupations included fishing, taverns, mills, a brick hut and a lime kiln.

[3] Mammern has an area, as of 2009[update], of 5.42 square kilometers (2.09 sq mi).

[4] The municipality is located in Frauenfeld District, on the Untersee of Lake Constance 4 km (2.5 mi) east of Stein am Rhein.

Most of the population (as of 2000[update]) speaks German(87.1%), with Portuguese being second most common ( 3.9%) and Albanian being third ( 2.1%).

[6] The age distribution, as of 2009[update], in Mammern is; 64 children or 11.0% of the population are between 0 and 9 years old and 79 teenagers or 13.5% are between 10 and 19.

[12] In the 2007 federal election the most popular party was the SVP which received 45.93% of the vote.

[13] The historical population is given in the following table:[3][14] The castle with park and chapel and the pilgrimage church of Mariahilf in Klingenzell are listed as Swiss heritage sites of national significance.

[7] From the 2000 census[update], 195 or 36.6% were Roman Catholic, while 232 or 43.5% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 2 or 16.7% are female, 6 or 50.0% are not Swiss citizens and 4 or 33.3% do not speak German natively.

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

At the lower primary level, there are 8 children or 38.1% of the total population who are female, 9 or 42.9% are not Swiss citizens and 8 or 38.1% do not speak German natively.

In the upper primary level, there are 8 or 40.0% who are female, 1 or 5.0% are not Swiss citizens and 4 or 20.0% do not speak German natively.