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

[3] In the Egelsee area (north of Niederwil) a number of significant artifacts from the Pfyn culture have been discovered.

In 889 King Arnulf gave his follower Diethelm a manor house in Gachnang with ten dependent huts.

The Lords of Gachnang administered the village as a Ministerialis (unfree knights in the service of a feudal overlord) for first the Kyburg and later Reichenau Abbey.

[3] The farming village has not grown far from the medieval settlement centers of the church and castle.

In 1998 the villages of Kefikon, Islikon, Gerlikon, Niederwil and Oberwil merged with Gachnang.

[3] Gachnang has an area, as of 2009[update], of 9.72 square kilometers (3.75 sq mi).

It consists of the villages of Gachnang, Kefikon, Islikon and Niederwiland and the hamlets of Strass and Bethelhausen as well as Oberwil with Rosenhuben.

[7] Most of the population (as of 2000[update]) speaks Swiss German (93.3%), with Italian being second most common ( 2.7%) and Albanian being third ( 0.7%).

[7] The age distribution, as of 2009[update], in Gachnang is; 397 children or 11.6% of the population are between 0 and 9 years old and 460 teenagers or 13.4% are between 10 and 19.

[13] In the 2007 federal election the most popular party was the SVP which received 45.49% of the vote.

In the federal election, a total of 1,107 votes were cast, and the voter turnout was 48.5%.

[14] The historical population is given in the following table:[3] The Egelsee (prehistoric shore front settlement) and Former Factory Greuterhof with a Barn are listed as Swiss heritage site of national significance.

[8] From the 2000 census[update], 820 or 28.2% were Roman Catholic, while 1,560 or 53.7% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 50 or 57.5% are female, 6 or 6.9% are not Swiss citizens and 8 or 9.2% 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 75 children or 48.7% of the total population who are female, 13 or 8.4% are not Swiss citizens and 12 or 7.8% do not speak German natively.

In the upper primary level, there are 72 or 50.7% who are female, 10 or 7.0% are not Swiss citizens and 6 or 4.2% do not speak German natively.