Neunforn is a municipality in the district of Frauenfeld in the canton of Thurgau in Switzerland.

The Freiherr of Teufen sold his property in Neunforn to Töss Monastery in 1250.

[3] During the Protestant Reformation, Zurich closed Töss Monastery and took over the parish rights in Neunforn.

Neunforn has an area, as of 2009[update], of 11.36 square kilometers (4.39 sq mi).

[4] The municipality is located in the Frauenfeld district in the lower Thur Valley.

It consists of the villages of Oberneunforn, Niederneunforn and Wilen bei Neunforn.

[7] The age distribution, as of 2009[update], in Neunforn is; 77 children or 7.8% of the population are between 0 and 9 years old and 121 teenagers or 12.3% are between 10 and 19.

In the federal election, a total of 389 votes were cast, and the voter turnout was 54.0%.

[14] The historical population is given in the following table:[3] The Reformed Church is listed as a Swiss heritage site of national significance.

The villages of Niederneunforn, Obernunforn, Wilen bei Neunforn and the hamlet of Farhof are all listed in the Inventory of Swiss Heritage Sites.

[8] From the 2000 census[update], 108 or 11.7% were Roman Catholic, while 683 or 73.8% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 4 or 36.4% were female, 3 or 27.3% were not Swiss citizens and 3 or 27.3% did not speak German natively.

The lower and upper primary levels began at about age 5-6 and lasted for 6 years.

At the lower primary level, there were 12 children or 42.9% who were female, 1 or 3.6% were not Swiss citizens and 2 or 7.1% did not speak German natively.

In the upper primary level, there were 17 or 53.1% who were female, 3 or 9.4% were not Swiss citizens and 5 or 15.6% did not speak German natively.