Jenaz is first mentioned in the second half of the 12th Century as Junazis.
Geography
Jenaz has an area,, of. Of this area, 48.1% is used for agricultural purposes, while 38.8% is forested. Of the rest of the land, 3% is settled and the remainder is non-productive. Before 2017, the municipality was located in the Jenaz sub-district of the Prättigau/Davos district, after 2017 it was part of the Prättigau/Davos Region. It consists of the old village of Jenaz on a terrace above the Landquart river, the new linear village on the valley floor, the hamlet of Rüti on the right side of the Landquart and the section of Pragg-Jenaz on the Furnerbach.
Demographics
Jenaz has a population of. , 7.5% of the population was made up of foreign nationals. Over the last 10 years the population has decreased at a rate of -7%. Most of the population speaks German, with Albanian being second most common and Romansh being third. , the gender distribution of the population was 49.8% male and 50.2% female. The age distribution,, in Jenaz is; 128 children or 11.3% of the population are between 0 and 9 years old and 146 teenagers or 12.9% are between 10 and 19. Of the adult population, 115 people or 10.2% of the population are between 20 and 29 years old. 168 people or 14.9% are between 30 and 39, 163 people or 14.4% are between 40 and 49, and 152 people or 13.5% are between 50 and 59. The senior population distribution is 105 people or 9.3% of the population are between 60 and 69 years old, 90 people or 8.0% are between 70 and 79, there are 54 people or 4.8% who are between 80 and 89 there are 9 people or 0.8% who are between 90 and 99. In the 2007 federal election the most popular party was the FDP which received 43.1% of the vote. The next three most popular parties were the SVP, the SP and the CVP. The entire Swiss population is generally well educated. In Jenaz about 67.3% of the population have completed either non-mandatory upper secondary education or additional higher education. Jenaz has an unemployment rate of 0.45%. , there were 81 people employed in the primary economic sector and about 36 businesses involved in this sector. 144 people are employed in the secondary sector and there are 24 businesses in this sector. 99 people are employed in the tertiary sector, with 38 businesses in this sector. From the, 146 or 12.9% are Roman Catholic, while 862 or 76.3% belonged to the Swiss Reformed Church. Of the rest of the population, there are 10 individuals who belong to the Orthodox Church, and there are 18 individuals who belong to another Christian church. There are 43 who are Islamic. There is 1 individual who belongs to another church, 23 belong to no church, are agnostic or atheist, and 27 individuals did not answer the question. The historical population is given in the following table:
