Geneva, Switzerland
Onex cadastral map: plots, homes and population
Onex had 19,101 residents at the end of 2025 and 8,589 homes, 8.9% of them second homes.
Tap a plot in Onex (Switzerland) on the map to see its size, dimensions and sun exposure.
Open the Onex mapHousing in Onex
Official figures for the municipality of Onex, canton of Geneva.
- Residents, end of 2025
- 19,101
- Homes
- 8,589
- Second homes
- 8.9%
- New homes 2020–2024
- 120
- per 1,000 residents: 6.3
- Density
- 6,798
- residents per km²
- Municipal area
- 2.8 km²
Change since the end of 2024: +1% (Switzerland: +0.8%).
From 2020 to 2024, 120 new homes were built in Onex, 6.3 per 1,000 residents (Switzerland: 24.9).
Sources: Swiss Federal Statistical Office, STATPOP (permanent resident population at 31 December 2024 and 2025) and construction and housing statistics; Federal Office for Spatial Development, housing inventory (March 2026); swisstopo, swissBOUNDARIES3D. Free use with the source cited.
Population
19,101
Sun exposure
N · E · S · W
Source
Mensuration officielle (swisstopo)
Frequently asked questions
What share of homes in Onex are second homes?
8.9% of the 8,589 homes in Onex are second homes (Federal Office for Spatial Development housing inventory, March 2026), against 15% across Switzerland.
How many homes are being built in Onex?
From 2020 to 2024, 120 new homes were built in Onex, 6.3 per 1,000 residents (Switzerland: 24.9). Change since the end of 2024: +1% (Switzerland: +0.8%).
Are there official property prices for Onex?
Switzerland publishes no open sale prices by municipality. Some cantons, such as Zurich, Geneva and Vaud, publish their own transaction statistics. OpenParcels shows the official population and housing figures and every plot of the official cadastral survey.
How do I find the size of a plot in Onex?
Open the map, zoom into Onex and tap the plot: its area, perimeter and dimensions appear instantly in m² or sq ft.
Is the Onex land registry free to browse?
Yes. It is free with no sign-up. Data comes from official cadastral sources where available and OpenStreetMap elsewhere.
How can I tell if a garden gets good sun?
Each plot card has a sun compass showing which way the garden or main façade faces (due south, west…), computed from the plot and building shapes.
Neighbouring municipalities