[10] During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee.

On 1 January 1965, the Skogsholmen island area in western Tjøtta (population: 196) was incorporated into Vega Municipality.

The name of the farm (and the island on which it is located) comes from the word þjó which is a noun describing the "upper part of a thigh".

At the time of the municipal dissolution, it was part of the Tjøtta prestegjeld and the Nord-Helgeland prosti (deanery) in the Diocese of Sør-Hålogaland.

The municipal council (Herredsstyre) of Tjøtta was made up of 17 representatives that were elected to four year terms.