in the municipality is flowing water. The municipality is located in the Weinfelden district, on the southern slope of the Bodenseerücken mountains about east of Berg. It consists of the villages of Birwinken, Andwil, Happerswil-Buch, Klarsreuti and Mattwil. Demographics Birwinken has a population () of . , 7.3% of the population are foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 8.1%. Most of the population () speaks German (96.9%), with Albanian being second most common ( 0.8%) and Italian being third ( 0.4%). , the gender distribution of the population was 51.0% male and 49.0% female. The population was made up of 614 Swiss men (47.1% of the population), and 51 (3.9%) non-Swiss men. There were 595 Swiss women (45.6%), and 44 (3.4%) non-Swiss women. In there were 11 live births to Swiss citizens and births to non-Swiss citizens, and in same time span there were 9 deaths of Swiss citizens. Ignoring immigration and emigration, the population of Swiss citizens increased by 2 while the foreign population remained the same. There were 2 Swiss men who emigrated from Switzerland to another country, 4 Swiss women who emigrated from Switzerland to another country and 4 non-Swiss men who emigrated from Switzerland to another country. The total Swiss population change in 2008 (from all sources) was an increase of 28 and the non-Swiss population change was an increase of 5 people. This represents a population growth rate of 2.6%. The age distribution, , in Birwinken is; 161 children or 12.4% of the population are between 0 and 9 years old and 199 teenagers or 15.4% are between 10 and 19. Of the adult population, 130 people or 10.0% of the population are between 20 and 29 years old. 138 people or 10.6% are between 30 and 39, 228 people or 17.6% are between 40 and 49, and 190 people or 14.7% are between 50 and 59. The senior population distribution is 114 people or 8.8% of the population are between 60 and 69 years old, 77 people or 5.9% are between 70 and 79, there are 54 people or 4.2% who are between 80 and 89, and there are 5 people or 0.4% who are 90 and older. , there were 433 private households in the municipality, and an average of 2.7 persons per household. there were 190 single family homes (or 82.3% of