Mörschwil is a municipality in the Wahlkreis (constituency) of Rorschach in the canton of St. Gallen in Switzerland. Mörschwil is first mentioned in 811 as Maurini vilare. In 1389 it was mentioned as Mörswile. Mörschwil has an area, , of . Of this area, 59.2% is used for agricultural purposes, while 22% is forested. Of the rest of the land, 18.2% is settled (buildings or roads) and the remainder (0.6%) is non-productive (rivers or lakes). The municipality is located in the Rorschach Wahlkreis. It is located on the cantonal road from Rorschach to St. Gallen between the Steinach and Goldach rivers. It consists of the village of Mörschwil and many scattered hamlets and individual houses. The blazon of the municipal coat of arms is Gules a Griffin passant Or. Mörschwil has a population (as of ) of . , about 7.2% of the population was made up of foreign nationals. Of the foreign population, (), 66 are from Germany, 32 are from Italy, 40 are from ex-Yugoslavia, 20 are from Austria, and 55 are from another country. Over the last 10 years the population has grown at a rate of 13.4%. Most of the population () speaks German (96.7%), with Albanian being second most common ( 0.6%) and French being third ( 0.4%). Of the Swiss national languages (), 3,013 speak German, 14 people speak French, 12 people speak Italian, and 3 people speak Romansh. The age distribution, , in Mörschwil is; 427 children or 13.7% of the population are between 0 and 9 years old and 472 teenagers or 15.1% are between 10 and 19. Of the adult population, 323 people or 10.4% of the population are between 20 and 29 years old. 512 people or 16.4% are between 30 and 39, 498 people or 16.0% are between 40 and 49, and 430 people or 13.8% are between 50 and 59. The senior population distribution is 223 people or 7.2% of the population are between 60 and 69 years old, 163 people or 5.2% are between 70 and 79, there are 62 people or 2.0% who are between 80 and 89, and there are 6 people or 0.2% who are between 90 and 99. there were 278 persons (or 8.