La Sagne is a municipality in the district of La Chaux-de-Fonds in the canton of Neuchâtel in Switzerland.HistoryLa Sagne is first mentioned in 1332 as la Sagne.GeographyLa Sagne has an area, of 25.6km2. Of this area, 15.29km2 or 59.8% is used for agricultural purposes, while 9.45km2 or 37.0% is forested. Of the rest of the land, 0.8km2 or 3.1% is settled (buildings or roads), 0.04km2 or 0.2% is either rivers or lakes and 0.02km2 or 0.1% is unproductive land.Of the built up area, housing and buildings made up 1.5% and transportation infrastructure made up 1.3%. Out of the forested land, 33.7% of the total land area is heavily forested and 3.3% is covered with orchards or small clusters of trees. Of the agricultural land, 0.5% is used for growing crops and 45.8% is pastures and 13.5% is used for alpine pastures. All the water in the municipality is flowing water.The municipality is located in the La Chaux-de-Fonds district, in the eastern part of the Vallée de La Sagne et des Ponts-de-Martel. It consists of the linear village of La Sagne and the hamlets of Les Cœudres, Le Crêt, Miéville, La Sagne-Eglise and La Corbatière.Coat of armsThe blazon of the municipal coat of arms is Argent, issuant from three Mounts Vert as many Pine trees of the same.DemographicsLa Sagne has a population of., 6.0% of the population are resident foreign nationals. Over the last 10 years (2000–2010) the population has changed at a rate of 5.1%. It has changed at a rate of 7.6% due to migration and at a rate of 3.7% due to births and deaths.