Grandsherred (later spelled Gransherad) was established as a municipality in 1860 after the parish of Hovin (population: 815) in southeastern Tinn Municipality and the parish of Grandsherred (population: 1,310) in western Hjartdal Municipality were merged to form the new municipality. On 1 January 1886, the growing municipality was divided based on its "old" borders, with the old parish of Hovin (population: 885) becoming its own municipality. This left the remainder of Gransherad with a population of 1,393 residents in the now-smaller municipality.[7]
During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, the upper Jondalen valley area (population: 132) of eastern Gransherad was transferred to the neighboring Kongsberg Municipality (in Buskerud county). Also on the same date, Gransherad municipality was dissolved and the following areas were merged to form a new, larger Notodden Municipality:[7]
the rest of Gransherad Municipality (population: 1,115)
The municipality (originally the parish) is named after an old name for the area (Old Norse: Grandalsherað). The first element of the genitive case of the name Grandalr, an old name for a local valley and/or farm area. The first part of this is derived from the word grǫn which means "spruce" and the last part of this is identical to the word dalr which means "valley" or "dale".The last element of the word is herað which means "rural district".[8] Historically, the name of the municipality was spelled Gransherred. In 1867, the spelling was changed to Grandsherred. This was short-lived, however, because in 1888, the spelling was changed back to Gransherred. On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Gransherad, using the Nynorsk spelling instead of the Bokmål spelling.[9]
The municipal council(Herredsstyre) of Gransherad was made up of representatives that were elected to four year terms. The tables below show the historical composition of the council by political party.
^Helland, Amund (1900). "Gransherred herred". VIII. Bratsberg Amt. Anden del. Norges land og folk (in Norwegian). Kristiania, Norway: H. Aschehoug & Company. p. 455. Retrieved 27 August 2023.