Onex
Municipality in the canton of Geneva · FSO no. 6631
Parcel data from Jul 2025, statistics computed on 26 Sept 2026.
The parcel data lists 1’596 parcels in Onex, covering 2.8 km². 73% of them have at least one registered building. The median parcel measures 690 m².
Key figures
- Parcels
- 1’596
- 2.2% of the canton
- Total area
- 2.8 km²
1% of the canton
- Median area
- 690 m²
Canton: 895 m²
Switzerland: 870 m²
- Built share
- 73%
Canton: 57.6%
Switzerland: 52%
- Median year built
- 1983
Canton: 1983
Switzerland: 1976
About Onex
Onex ranks 13th of 45 municipalities in the canton of Geneva by number of parcels and holds 2.2% of the canton's parcels on 1% of its area. The median parcel in Onex measures 690 m², smaller than the canton median of 895 m². Onex is more built-up than the canton as a whole: 73% of its parcels have a building, against 57.6% across the canton.
The zones with the most parcels are Zone de développement 5 (57.8%), Zone de développement 3 (26.7%) and Zone de développement 4B protégée (11.3%). In total, Onex uses 8 zone designations.
According to the building register, Onex has 2’096 buildings with 8’583 dwellings, 4.1 dwellings per building on average. Most residential buildings are single-family houses (65%). Non-residential buildings account for 37.1% of all buildings.
Built parcels most often have their newest building from 1961 to 1980 (29.5% of them), and 27.1% have one from 2001 or later. The median year built, 1983, is the same as in the canton as a whole.
Built and unbuilt parcels
Built: 1’165 (73%)Unbuilt: 431 (27%)
Parcels by zone
| Zone | Parcels | Area | Built |
|---|---|---|---|
| Zone de développement 5 | 922 | 0.94 km² | 83.9% |
| Zone de développement 3 | 426 | 0.73 km² | 61.0% |
| Zone de développement 4B protégée | 180 | 0.23 km² | 63.3% |
| Zone agricole | 26 | 0.12 km² | 19.2% |
| Zone des bois et forêts | 22 | 0.27 km² | 27.3% |
| Zone de verdure | 15 | 0.41 km² | 33.3% |
| Zone des eaux et des rives | 3 | 0.07 km² | 0.0% |
| Zone sportive | 2 | 0.04 km² | 50.0% |
Zone names are the municipal designations. A canton lists each wording separately.
Building stock
The building register lists 2’096 buildings with 8’583 dwellings here; 840 of them are single-family houses.
- Buildings
- 2’096
- Dwellings
- 8’583
- Single-family houses
- 840
- Building volume
- 3.6 million m³
Buildings by category
Construction periods
Built parcels by construction period of their newest buildingMaps and geodata for Onex
geopool works as a GIS and geoportal for Onex. 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.
Explore more data for Onex
- Building zones and density Onexin room
- ÖREB extract Onexin lookup
- Building age Onexin roots
- Building heights and headroom Onexin roofs
- Solar potential Onexin soolar
- Points of interest and accessibility Onexin scoore
- Tax rates Onexin taxoo
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