Onex: population and statistics
Onex has a population of 19,101 (2025) across 2.8 km², or 6,773 people per km². It ranks 62 of 2,115 municipalities by population. Its population is growing: +2.5% between 2015 and 2025.
- 19,101 residents
- 2.8 km²
- 6,773 people/km²
- 428 m
Key points
Among the 45 municipalities in Geneva, Onex ranks No. 6 by population.
Rooftop solar potential per inhabitant: 1,967 kWh/inh. in Onex, compared with an average of 3,823 kWh/inh. in Geneva and 7,100 kWh/inh. nationally.
Entities in the commercial register per 1,000 inhabitants: 31.5 in Onex, compared with an average of 101.6 in Geneva and 83.6 nationally.
A 1 kWp solar panel tilted at 38° generates about 1,281 kWh a year here.
Onex in numbers
Where is Onex?
Population of Onex over time
Onex had 18,635 residents in 2015 and 19,101 in 2025.
| Year | Population |
|---|---|
| 2020 | 18,933 |
| 2021 | 18,821 |
| 2022 | 18,773 |
| 2023 | 18,886 |
| 2024 | 18,915 |
| 2025 | 19,101 |
Did you know?
- “Rooftop solar potential per inhabitant”: lower than in 99% of municipalities.
- “Entities in the commercial register per 1,000 inhabitants”: lower than in 99% of municipalities.
- “Dwellings in buildings built before 1946”: lower than in 98% of municipalities.
- Its area is roughly equal to 395 football pitches.
- Its population density is 29.1 times the national average.
- The nearest municipality is Confignon, 1.3 km away.
- The nearest more populous municipality is Lancy (37,520 residents), 1.4 km away.
All indicators for Onex
Value for the municipality, then the regional average and the national median (for counts: regional and national totals). The gauge places the municipality between the lowest and highest value in the country.
Population
| Indicator | Onex | Geneva | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 65 and over (2025) | 19.2% | 16.7% | 20.7% | ranked 1,174 of 1,811 |
Housing
| Indicator | Onex | Geneva | National | Position? | Rank |
|---|---|---|---|---|---|
| Dwellings (2026) | 8,583 | 256,816 | 4,927,050 | ranked 85 of 2,108 | |
| Dwellings in buildings built before 1946 (2026) | 4.8% | 20.4% | 23.3% | ranked 1,776 of 1,806 | |
| Dwellings in buildings built since 2001 (2026) | 13.2% | 20.5% | 25.3% | ranked 1,587 of 1,806 | |
| Share of single-family houses among residential buildings (2026) | 64.8% | 43.2% | 69.5% | ranked 1,150 of 1,806 |
Energy
| Indicator | Onex | Geneva | National | Position? | Rank |
|---|---|---|---|---|---|
| Oil or gas heating systems (2026) | 65.8% | 80.7% | 53.5% | ranked 492 of 1,806 | |
| Heat pumps as main heating (2026) | 5.8% | 4.2% | 13.7% | ranked 1,616 of 1,806 | |
| Wood heating systems (2026) | 1.3% | 1.5% | 12.4% | ranked 1,756 of 1,806 | |
| District heating (2026) | 22.8% | 9.2% | 1.4% | ranked 53 of 1,806 | |
| Photovoltaic installations (2026) | 286 | 8,437 | 329,600 | ranked 296 of 2,108 | |
| Installed photovoltaic capacity per 1,000 inhabitants (2026) | 202.2 kW | 319.8 kW | 1,134 kW | ranked 1,788 of 1,806 | |
| Rooftop solar electricity potential (2026) | 37.6 GWh/year | 2,053 GWh/year | 64,783 GWh/year | ranked 518 of 2,114 | |
| Rooftop solar potential per inhabitant (2026) | 1,967 kWh/inh. | 3,823 kWh/inh. | 9,356 kWh/inh. | ranked 1,810 of 1,810 |
Economy
| Indicator | Onex | Geneva | National | Position? | Rank |
|---|---|---|---|---|---|
| Establishments (2024) | 746 | 46,510 | 728,011 | ranked 171 of 2,112 | |
| Entities listed in the commercial register (2026) | 602 | 54,549 | 762,757 | ranked 241 of 2,115 | |
| Entities in the commercial register per 1,000 inhabitants (2026) | 31.5 | 101.6 | 64.9 | ranked 1,800 of 1,811 | |
| Share of limited companies (AG, GmbH) among registered entities (2026) | 56.0% | 71.9% | 65.7% | ranked 1,579 of 1,808 | |
| Share of sole proprietorships among registered entities (2026) | 39.7% | 22.8% | 29.0% | ranked 178 of 1,808 |
Employment
| Indicator | Onex | Geneva | National | Position? | Rank |
|---|---|---|---|---|---|
| Jobs (2024) | 5,094 | 401,982 | 5,679,518 | ranked 190 of 2,111 | |
| Jobs per 1,000 inhabitants (2024) | 266.7 | 748.4 | 362.9 | ranked 1,301 of 1,810 | |
| Share of jobs in services (2024) | 84.0% | 86.4% | 63.6% | ranked 211 of 1,804 | |
| Share of jobs in industry and construction (2024) | 15.5% | 12.7% | 24.2% | ranked 1,318 of 1,776 |
Society
| Indicator | Onex | Geneva | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of foreign nationals (2025) | 37.4% | 41.9% | 18.9% | ranked 107 of 1,811 |
Sunshine and temperatures: Onex
Frequently asked questions
What is the population of Onex?
Onex has 19,101 residents (2025), ranking 62 of 2,115 municipalities.
How big is Onex?
Onex covers 2.8 km², with a density of 6,773 people per km².
Is the population of Onex growing?
Between 2015 and 2025, the population of Onex went from 18,635 to 19,101, a change of +2.5%.
Where is Onex?
Onex is in Geneva. It belongs to Canton de Genève (district). Latitude 46.183, longitude 6.100.
Rooftop solar potential per inhabitant: what is the figure for Onex?
In Onex, “Rooftop solar potential per inhabitant” stands at 1,967 kWh/inh. (2026), ranking 1,810 of 1,810 municipalities; the national median is 9,356 kWh/inh..
Entities in the commercial register per 1,000 inhabitants: what is the figure for Onex?
In Onex, “Entities in the commercial register per 1,000 inhabitants” stands at 31.5 (2026), ranking 1,800 of 1,811 municipalities; the national median is 64.9.
How much electricity does a solar panel produce in Onex?
In Onex, a 1 kWp south-facing system tilted at 38° produces about 1,281 kWh a year.
Which municipalities border Onex?
The nearest to Onex are Confignon (1.3 km), Lancy (1.4 km), Vernier (1.9 km), Plan-les-Ouates (2.3 km), Bernex (2.5 km).