Tübach is a municipality in the Wahlkreis (constituency) of Rorschach in the canton of St. Gallen in Switzerland. Tübach has an area, , of . Of this area, 60.5% is used for agricultural purposes, while 7.7% is forested. The rest of the land, (31.8%) is settled. The blazon of the municipal coat of arms is Argent a Bend wavy Azure and in chief sinister a letter T Gules. Tübach has a population (as of ) of . , about 10.9% of the population was made up of foreign nationals. Of the foreign population, (), 31 are from Germany, 21 are from Italy, 15 are from ex-Yugoslavia, 23 are from Austria, 7 are from Turkey, and 27 are from another country. Over the last 10 years the population has grown at a rate of 8.6%. Most of the population () speaks German (95.9%), with Italian being second most common ( 1.1%) and Spanish being third ( 0.7%). Of the Swiss national languages (), 1,014 speak German, 5 people speak French, 12 people speak Italian, The age distribution, , in Tübach is; 121 children or 11.4% of the population are between 0 and 9 years old and 134 teenagers or 12.7% are between 10 and 19. Of the adult population, 105 people or 9.9% of the population are between 20 and 29 years old. 171 people or 16.2% are between 30 and 39, 176 people or 16.7% are between 40 and 49, and 161 people or 15.2% are between 50 and 59. The senior population distribution is 109 people or 10.3% of the population are between 60 and 69 years old, 56 people or 5.3% are between 70 and 79, there are 23 people or 2.2% who are between 80 and 89, and there is 1 person who is between 90 and 99. there were 135 persons (or 12.8% of the population) who were living alone in a private dwelling. There were 285 (or 27.0%) persons who were part of a couple (married or otherwise committed) without children, and 556 (or 52.6%) who were part of a couple with children. There were 39 (or 3.7%) people who lived in single parent home, while there are 3 persons who were adult children living with one or both parents, 4 persons who lived in a household made up of relatives, 10 who lived household made up of unrelated persons, and 25 who are either institutionalized or live in another type of collective housing.