Pins Vefsn Kommune - Vefsn is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative centre of the municipality is the town of Mosjøen. Other villages include Drevvassbygda, Elsfjord, and Husvik. The 1,929 square kilometre municipality is the 33rd largest by area in Norway. Vefsn is the 87th most populous municipality in Norway with a population of 13,465.