Riein is first mentioned in 765 as Renino. In 960 it was mentioned as Raine.
Geography
Before the merger, Riein had a total area of. Of this area, 21.9% is used for agricultural purposes, while 37.2% is forested. Of the rest of the land, 0.9% is settled and the remainder is non-productive. The former municipality is located in the Ilanz sub-district of the Surselva district. It is located at the entrance to the Lumnezia on a terrace east of the Glenner. It consists of the haufendorf village of Riein and the hamlet of Signina, which joined Riein in 1904-05. Signina is separated from Reien by the Val da Riein.
Demographics
Riein had a population of 67., 1.6% of the population was made up of foreign nationals. Over the last 10 years the population has decreased at a rate of -22.2%. Most of the population speaks Romansh, with German being second most common and Italian being third. , the gender distribution of the population was 45.7% male and 54.3% female. The age distribution,, in Riein is; 6 children or 8.5% of the population are between 0 and 9 years old and 7 teenagers or 9.9% are between 10 and 19. Of the adult population, 5 people or 7.0% of the population are between 20 and 29 years old. 9 people or 12.7% are between 30 and 39, 9 people or 12.7% are between 40 and 49, and 13 people or 18.3% are between 50 and 59. The senior population distribution is 8 people or 11.3% of the population are between 60 and 69 years old, 11 people or 15.5% are between 70 and 79, there are 2 people or 2.8% who are between 80 and 89 there is 1 person who is between 90 and 99. In the 2007 federal election the most popular party was the SVP which received 68.9% of the vote. The next three most popular parties were the FDP, the CVP and the SP. In Riein about 50% of the population have completed either non-mandatory upper secondary education or additional higher education. Riein has an unemployment rate of 0.54%., there were 15 people employed in the primary economic sector and about 6 businesses involved in this sector. people are employed in the secondary sector and there are businesses in this sector. 3 people are employed in the tertiary sector, with 1 business in this sector. The historical population is given in the following table:
