Winterthur is a city located in the canton of Zurich in northern Switzerland. Situated approximately 20 kilometres northeast of Zurich, it serves as a service and high-tech industrial satellite city within the broader Zurich Metropolitan Area.
The city is the sixth-largest in Switzerland by population, with over 120,000 residents, while its agglomeration accounts for about 140,000 inhabitants. In local dialect, the city is commonly abbreviated as Winti.