Melhus is a municipality in Trøndelag county, Norway. It is part of the Gauldalen region. The administrative centre of the municipality is the village of Melhus. Other villages include Gåsbakken, Hovin, Korsvegen, Kvål, Ler, Lundamo, Storsand, and Øysand. Agriculture is important in Melhus, and the extensive lowland areas in the almost flat valley surrounding the Gaula River are dominated by grain fields. Many inhabitants work in the city of Trondheim, a 20-minute drive north from Melhus. The municipality is the 166th largest by area out of the 356 municipalities in Norway. Melhus is the 75th most populous municipality in Norway with a population of 16,123. The municipality's population density is and its population has increased by 11.2% over the previous 10-year period. Melhus was established as a municipality on 1 January 1838 (see formannskapsdistrikt law). In 1865, the western district of Høilandet (population: 1,818) was separated from Melhus to form a separate municipality. Then on 1880, the eastern district of Flaa (population: 614) was separated to form its own municipality. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, Melhus (population: 3,978) was merged with the neighboring municipalities of Hølonda (population: 1,428), Flå (population: 843), Horg (population: 2,560), and the small Langørgen farm area in the neighboring municipality of Buvik (population: 11) to form a new, larger municipality of Melhus. On 1 January 2018, the municipality switched from the old Sør-Trøndelag county to the new Trøndelag county. The municipality (originally the parish) is named after the old Melhus farm (Meðalhúsar) since the first Melhus Church was built there. The first element is meðal which means "middle". The last element is the plural form of hús which means "house". The farm is one part of a greater and older farm, which had the name Óðinssalr which means "the salr (mead hall) of Odin". The coat of arms was granted on 8 November 1979.