Le Locle is a municipality in Le Locle District in the Canton of Neuchâtel in Switzerland.It is situated in the Jura Mountains, a few kilometers from the city of La Chaux-de-Fonds.It is the third smallest city in Switzerland (in Switzerland a place needs more than 10,000 inhabitants to be considered a city).Le Locle is known as a center of Swiss watchmaking, even cited as the birthplace of the industry, with roots dating back to the 1600s.