Namdalen is a traditional district in the central part of Norway, consisting of the municipalities of Namsos, Grong, Overhalla, Røyrvik, Nærøysund, Høylandet, Flatanger, Lierne, Leka, and Namsskogan, all in Trøndelag county. The district has three towns: Namsos, Rørvik and Kolvereid. The whole district covers about 11,860 square kilometres (4,580 sq mi) and has about 35,000 residents (2009).