- Chiasso is a city located in the district of Mendrisio in the canton of Ticino, Switzerland. It is situated on the border with Italy and is part of the metropolitan area of Lugano. The city has a population of approximately 8,500 people and is known for its strategic location as a border crossing between Switzerland and Italy. Chiasso is a major transportation hub, with a railway station and several highways connecting it to other parts of Switzerland and Europe. The city has a mix of Swiss and Italian culture, with Italian being the predominant language spoken. Chiasso is also home to various companies and businesses, making it an important economic center in the region.