Flatanger is a municipality in Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is Lau…Flatanger is a municipality in Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is Lauvsnes. Other villages include Jøssund, Hasvåg, and Vik. The 459-square-kilometre municipality is the 216th largest by area out of the 357 municipalities in Norway. Flatanger is the 326th most populous municipality in Norway with a population of 1,116. The municipality's population density is 2.4 inhabitants per square kilometre and its population has decreased by 0.4% over the previous 10-year period.