Sion
Municipality in the canton of Valais · FSO no. 6266
Parcel data from Nov 2026, statistics computed on 29 Oct 2026.
Open map at the Sion centerThe parcel data lists 13’196 parcels in Sion, covering 28.2 km². 40.4% of them have at least one registered building. The median parcel measures 792 m².
Key figures
- Parcels
- 13’196
- 2.1% of the canton
- Total area
- 28.2 km²
- 0.8% of the canton
- Median area
- 792 m²
- Canton: 518 m²
- Switzerland: 881 m²
- Built share
- 40.4%
- Canton: 26%
- Switzerland: 51%
- Median year built
- 1975
- Canton: 1980
- Switzerland: 1975
About Sion
Sion ranks 11th of 122 municipalities in the canton of Valais by number of parcels and holds 2.1% of the canton's parcels on 0.8% of its area. The median parcel in Sion measures 792 m², larger than the canton median of 518 m². Sion is more built-up than the canton as a whole: 40.4% of its parcels have a building, against 26% across the canton.
The zones with the most parcels are Zone agricole (16.1%), Habitat individuel plaine (9.5%) and Zone agricole 1 et 2 (8.2%). In total, Sion uses 70 zone designations.
According to the building register, Sion has 6’029 buildings with 21’572 dwellings, 3.6 dwellings per building on average. Residential buildings mix single-family houses and buildings with several dwellings: single-family houses make up 53.9% of them. Non-residential buildings account for 15.2% of all buildings.
Built parcels most often have their newest building from 1981 to 2000 (19% of them), and 23.2% have one from 2001 or later. The median year built, 1975, is close to that of the canton as a whole (1980).
Built and unbuilt parcels
Built: 5’336 (40.4%)
Unbuilt: 7’860 (59.6%)
Parcels by zone
| Zone | Parcels | Area | Built |
|---|---|---|---|
| Zone agricole | 2’122 | 5.79 km² | 10.4% |
| Habitat individuel plaine | 1’255 | 1.02 km² | 77.1% |
| Zone agricole 1 et 2 | 1’085 | 2.10 km² | 9.0% |
| Zone résidentielle H30 | 747 | 0.63 km² | 56.4% |
| Aire forestière | 638 | 2.16 km² | 4.4% |
| Vieille ville | 481 | 0.13 km² | 64.9% |
| Forêt | 437 | 1.31 km² | 3.9% |
| Villages-Hameaux | 432 | 0.12 km² | 47.2% |
| Centre III | 428 | 0.47 km² | 74.3% |
| Zone agricole protégée | 335 | 0.26 km² | 4.8% |
| Habitat individuel coteau | 321 | 0.33 km² | 69.5% |
| Habitat individuel coteau sensible Différé | 307 | 0.29 km² | 55.0% |
| Other zones (58 labels) | 4’230 | 11.92 km² | 50.4% |
| No zone | 378 | 1.65 km² | 55.3% |
Zone names are the municipal designations. A canton lists each wording separately.
Building stock
The building register lists 6’029 buildings with 21’572 dwellings here; 2’631 of them are single-family houses.
- Buildings
- 6’029
- Dwellings
- 21’572
- Single-family houses
- 2’631
- Building volume
- 18.8 million m³
Buildings by category
Construction periods
Built parcels by construction period of their newest building
Maps and geodata for Sion
geopool works as a GIS and geoportal for Sion. Its parcel map shows the parcels of the official cadastral survey with their area, their zone from the municipal zoning plan and their buildings, on swisstopo maps. Building zones, the property map and the geodata of each parcel open on the geopool map. The ÖREB extract of a parcel (public-law restrictions on landownership) is in lookup.