Mosjøen (; ) is a town in Vefsn Municipality in Nordland county, Norway. Mosjøen is the oldest town in the Helgeland region, with only the town of Bodø being older within Nordland county. The town is also the administrative centre of Vefsn Municipality. The old village of Mosjøen was declared a ladested in 1875. It was also a town municipality () from 1875 until 1961 when it was merged into Vefsn, losing its status as a town (ladested). It is also a former garrison town and customs place. In 1998, the urban area of Mosjøen was declared to be a town once again. People from Mosjøen are referred to using the demonym "". The town has a population (2018) of 9,834 and a population density of .
Together with the other regional towns of Mo i Rana and Narvik, Mosjøen is one of the industrial towns in Nordland county. Owned by Alcoa, Mosjøen Aluminum Plant is among the biggest in Europe, and is traditionally the town's cornerstone. Additionally, the town's business sector includes trade, crafts, banking, transportation, and tourism. The town attracts customers from the entire region.
Mosjøen is a transport hub in Helgeland. From Mosjøen, it is to the town of Sandnessjøen in the west, to the town of Mo i Rana in the north, and to the town of Brønnøysund in the south. Furthermore, the road distance is to the town of Bodø and to the city of Trondheim. The European route E6 highway runs through the town. There are daily departures from Mosjøen Bus Central, from Mosjøen Railway Station on the Nordland Line, and from Mosjøen Airport south of the town. There are both public and private quays in Mosjøen. The town's harbour is among the largest in Northern Norway.
In the aspect of secondary and adult education, Mosjøen exercises both local and regional functions. Offering general (including music), vocational, and agricultural lines, Mosjøen High School also receives students from rural municipalities surrounding the town and from other regions of Nordland. Vefsn Folk High School lies in Mosjøen, while Sandvik Folk High School is located north of it. The town has got a department of the Open University. Many bigger events for children and youths take place in Mosjøen, among others Toppen International Summer Music School and The Kippermoen Cup.
Mosjøen is known for Sjøgata: Northern Norway's longest cluster of 19th-century wooden houses and piers. Other tourist attractions include Dolstad Church from 1735, the award-winning Town Park from 1905, and the aluminum plant.
Etymology
The town is named after the old Mo farm () the town was built up on the outskirts of the large farm. The first element is derived from the word which is the plural form of which means "moorland". The last element is ( which means "sea" or "seaside". Mosjøen, therefor means "the sea(side) belonging to Mo". In other words, it was a place where the farmers of Mo had their boats and boatsheds. Earlier spellings are Moesøen in the 18th century and Mosøen in the 19th century.
History
Mentioned in Aslak Bolt's cadastre of the 15th century, Mo is a medieval farm with a history at least dating to the Viking Age. Mosjøen's own history starts in the early modern period. Mosjøen was populated by 1600. The earliest inhabitant known by name is Svein Beachdweller, who lived there together with his wife and daughters in 1660. In the 17th and early 18th century, especially following the 1645 Treaty of Brömsebro, several inhabitants of Jemtland escaped to Trøndelag and to Nordland. Many of them came to Vefsn, including Mosjøen. In the 18th century, Mosjøen as a settlement for nonagrarian occupations started to materialise. For example, the regional executioner resided there temporarily. As did a handful of craftsmen and public officials.
From the late 16th century until the 1820s, Mo was possessed by the Mo family: wealthy farmers as well as skippers and merchants who contributed to Mosjøen's gradual expansion. In 1794, a member of the family received royal privilege to establish a trading post in Mosjøen.
In the 1860s, a group of Englishmen—the 'salmon lords'—established The North of Europe Land & Mining Company, introducing the first industrial period in Mosjøen. Sawmill industry created 'Klondike conditions': People came from everywhere in order to get a job, to trade, and so on, and salaries were relatively high.