The tertiary sector is the main economic sector in Sion, mainly due to the presence of the cantons administration, the Valaisan parliament and the cantons courthouse. Tourism is also an important sector due to its historic ch�teau's and museums.
The secondary sector is also represented.
The primary sector, although marginalized, is ever present. Sion is the third largest wine making region in Switzerland, however, the valuable agricultural land and vineyards are undergoing constant regression due to the process of urbanisation.
Sion has also become an important medical site. The Sion-Region hospital is situated here next to the central institute of Valaisan hospitals and the Romande clinic for physical rehabilitation (SUVA).
Finally the commune hosts a waste incinerator which disposes of the waste from 44 surrounding communes. This incinerator is equipped with a catalytic converter which lowers the levels of NOx emissions below acceptable levels. In addition, the heat created from the combustion is converted into electrical energy which is then provided to local communes.
As of 2010, Sion had an unemployment rate of 6%. As of 2008, there were 415 people employed in the primary economic sector and about 125 businesses involved in this sector. 5,102 people were employed in the secondary sector and there were 357 businesses in this sector. 20,227 people were employed in the tertiary sector, with 1,906 businesses in this sector. There were 13,101 residents of the municipality who were employed in some capacity, of which females made up 45.5% of the workforce.
In 2008 the total number of full-time equivalent jobs was 21,338. The number of jobs in the primary sector was 245, all of which were in agriculture. The number of jobs in the secondary sector was 4,830 of which 1,976 or (40.9%) were in manufacturing, 51 or (1.1%) were in mining and 2,323 (48.1%) were in construction. The number of jobs in the tertiary sector was 16,263
