Uzwil was first mentioned in 819 as Uzzinwilare. The village of Henau was first mentioned 754 as Villa Aninauva at the Monastery of St. Gallen in the "Henau document".
Geography
Uzwil has an area,, of. Of this area, 53.7% is used for agricultural purposes, while 17.9% is forested. Of the rest of the land, 26.8% is settled and the remainder is non-productive. The municipality consists of the villages Niederuzwil, Uzwil, Henau, Algetshausen, Niederstetten, Oberstetten and Stolzenberg. It is located in the northern Toggenburg between Wil and Gossau.
Uzwil has a population of. , about 25.1% of the population was made up of foreign nationals. Of the foreign population,, 198 are from Germany, 400 are from Italy, 1,587 are from ex-Yugoslavia, 74 are from Austria, 202 are from Turkey, and 270 are from another country. Over the last 10 years the population has grown at a rate of 7.7%. Most of the population speaks German, with Serbo-Croatian being second most common and Albanian being third. Of the Swiss national languages, 10,321 speak German, 45 people speak French, 310 people speak Italian, and 21 people speak Romansh. The age distribution,, in Uzwil is; 1,558 children or 13.0% of the population are between 0 and 9 years old and 1,688 teenagers or 14.1% are between 10 and 19. Of the adult population, 1,483 people or 12.4% of the population are between 20 and 29 years old. 1,870 people or 15.6% are between 30 and 39, 1,754 people or 14.6% are between 40 and 49, and 1,440 people or 12.0% are between 50 and 59. The senior population distribution is 1,002 people or 8.4% of the population are between 60 and 69 years old, 719 people or 6.0% are between 70 and 79, there are 392 people or 3.3% who are between 80 and 89, and there are 69 people or 0.6% who are between 90 and 99, and 2 people who are 100 or more. there were 1,334 persons who were living alone in a private dwelling. There were 2,635 persons who were part of a couple without children, and 6,936 who were part of a couple with children. There were 575 people who lived in single parent home, while there are 64 persons who were adult children living with one or both parents, 24 persons who lived in a household made up of relatives, 96 who lived in a household made up of unrelated persons, and 313 who are either institutionalized or live in another type of collective housing. In the 2007 federal election the most popular party was the SVP which received 36.2% of the vote. The next three most popular parties were the CVP, the FDP and the SP. In Uzwil about 67.5% of the population have completed either non-mandatory upper secondary education or additional higher education. Out of the total population in Uzwil,, the highest education level completed by 2,754 people was Primary, while 4,328 have completed their secondary education, 1,207 have attended a Tertiary school, and 548 are not in school. The remainder did not answer this question.
, Uzwil had an unemployment rate of 2.58%. , there were 141 people employed in the primary economic sector and about 50 businesses involved in this sector. 4,126 people are employed in the secondary sector and there are 101 businesses in this sector. 2,179 people are employed in the tertiary sector, with 307 businesses in this sector. the average unemployment rate was 5.0%. There were 451 businesses in the municipality of which 104 were involved in the secondary sector of the economy while 303 were involved in the third. there were 2,837 residents who worked in the municipality, while 3,232 residents worked outside Uzwil and 3,763 people commuted into the municipality for work. The largest company in Uzwil is Bühler AG.
Transportation
Uzwil is on the St. Gallen–Winterthur railway and the A1-Autobahn Geneva-St. Margrethen.
Religion
From the, 5,446 or 45.5% are Roman Catholic, while 3,521 or 29.4% belonged to the Swiss Reformed Church. Of the rest of the population, there is 1 individual who belongs to the Christian Catholic faith, there are 552 individuals who belong to the Orthodox Church, and there are 357 individuals who belong to another Christian church. There are 887 who are Islamic. There are 82 individuals who belong to another church, 776 belong to no church, are agnostic or atheist, and 355 individuals did not answer the question.