What is the postal code of Onex?

Onex has 2 postal codes: 1212, 1213.

What is the tax rate in Onex?

The municipal tax multiplier of Onex is 50.5% (2026); canton GE levies 147.5%.

How much tax do you pay in Onex?

A single person without children pays about 15'875 CHF income tax in Onex on 100'000 CHF gross income (federal, cantonal, municipal), rank 43 of 45 in canton GE. Source: ESTV (2026).

How many residents does Onex have?

Onex has 19'101 residents (2025).

How many foreign residents live in Onex?

Onex has 7'136 foreign residents, a share of 37.36% (2025).

Switzerland · Canton GE

Onex

1212–1213

GE CANTON1212 1213

Residents

19'101

Area

2.8 km²

Population density

6'798 pop./km²

Elevation

429 m a.s.l.

Tax multiplier

50.5%

Postal codes

Relief © swisstopo · TINITALY · geoland.at · LGL · IGN

Demographics

BFS · 2025

Women

9'977 52.2%

Men

9'124 47.8%

Children & youth (0–19)

4'069 21.3%

Swiss citizens

11'965 62.6%

Foreign residents

7'136 37.4%

Population density

6'798 pop./km²

0–19 · 4'069 · 21.3%20–64 · 11'362 · 59.5%65+ · 3'670 · 19.2%

Foreign residents 37.4%0%64.0%

STATPOP 2025 · Federal Statistical Office (FSO), retrieved 31.08.2026 · swisstopo, retrieved 24.08.2026

Vote results for Onex

BFS

14.06.2026Änderung des Bundesgesetzes über den zivilen Ersatzdienst (Zivildienstgesetz, ZDG)Federal● Accepted · 52.5% Yes

42.0% YesNo 58.0%

14.06.2026Volksinitiative «Keine 10-Millionen-Schweiz! (Nachhaltigkeitsinitiative)»Federal● Rejected · 45.2% Yes

41.3% YesNo 58.8%

08.03.2026Bundesgesetz über die IndividualbesteuerungFederal● Accepted · 54.3% Yes

64.9% YesNo 35.1%

08.03.2026Volksinitiative «Für eine gerechte Energie- und Klimapolitik: Investieren für Wohlstand, Arbeit und Umwelt (Klimafonds-Initiative)»Federal● Rejected · 29.3% Yes

39.0% YesNo 61.0%

08.03.2026Volksinitiative «200 Franken sind genug! (SRG-Initiative)»Federal● Rejected · 38.1% Yes

39.9% YesNo 60.1%

08.03.2026Bargeldinitiative und Gegenvorschlag: StichfrageFederal● Rejected · 37.4% Yes

41.5% YesNo 58.5%

08.03.2026Bundesbeschluss über die schweizerische Währung und die Bargeldversorgung (Gegenvorschlag zur Bargeldinitiative)Federal● Accepted · 73.4% Yes

69.1% YesNo 30.9%

08.03.2026Volksinitiative «Ja zu einer unabhängigen, freien Schweizer Währung mit Münzen oder Banknoten (Bargeld ist Freiheit)»Federal● Rejected · 45.6% Yes

60.0% YesNo 40.0%

30.11.2025Volksinitiative «Für eine soziale Klimapolitik – steuerlich gerecht finanziert (Initiative für eine Zukunft)»Federal● Rejected · 21.7% Yes

31.5% YesNo 68.5%

30.11.2025Volksinitiative «Für eine engagierte Schweiz (Service-citoyen-Initiative)»Federal● Rejected · 15.9% Yes

14.8% YesNo 85.2%

All federal votes →

Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 31.08.2026

Politics

National Council election 2023

MCR19.4% · strongest party

MCR19.4%

SP18.8%

SVP16.6%

GRÜNE12.5%

FDP10.1%

sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 31.08.2026

Taxes 2026

ESTV

Municipal tax multiplier50.5%

Cantonal tax multiplier147.5%

50.5%GE range 25%51%

Tax rank 43 of 45 in canton Geneva

Tax burden

Single, 100'000 CHF gross income

15'875 CHF(15.9%)

Rank 43 of 45 in the canton · 1209 of 2110 in Switzerland

Median canton 15'212 CHF · median Switzerland 15'290 CHF

Cheapest Cologny 13'885 CHF · most expensive Avully 15'914 CHF

Income tax as % of gross income

100'000 CHF:15'875 CHF(~15.9%)

OnexCanton range GenevaSwitzerland median

Show data table

Gross income	Onex	Geneva	Switzerland median
40'000	5.3%	4.6–5.3%	5.4%
50'000	7.8%	6.8–7.8%	7.8%
60'000	10.1%	8.8–10.1%	10.5%
70'000	11.9%	10.4–12%	11.9%
80'000	13.4%	11.7–13.4%	13.1%
90'000	14.5%	12.7–14.6%	14.1%
100'000	15.9%	13.9–15.9%	15.3%
110'000	17.1%	14.9–17.1%	16.3%
120'000	18%	15.8–18.1%	17.2%
130'000	18.9%	16.6–18.9%	18.1%
140'000	19.8%	17.4–19.8%	19%
150'000	20.5%	18.1–20.6%	19.7%
175'000	22.4%	19.8–22.4%	21.6%
200'000	24%	21.3–24%	23.2%
225'000	25.4%	22.6–25.5%	24.6%
250'000	26.7%	23.8–26.7%	25.8%
275'000	27.7%	24.8–27.8%	26.8%
300'000	28.6%	25.6–28.6%	27.4%

2026 · Federal Tax Administration (FTA), retrieved 31.08.2026

Climate

MeteoSwiss 1 km grid · 1991–2020

Annual mean temperature 1991–202010.9 °C

Precipitation 1991–2020899 mm

10.9 °CCH range -5.5°14°

1991–2020 · MeteoSwiss, retrieved 28.08.2026

Terrain

swisstopo · DHM 40 m

Highest point

432 m

Mean elevation

413 m

Relief

63 m

Mean slope

3.4°

Flat share

82.2%

South-facing

6.9%

Above 2000 m

0.0%

Relief 63 m0 m3'847 m

Terrain figures cover the whole municipal territory (swisstopo swissALTIRegio) — not the settlement point. Slope and south-facing share are resolution-dependent and measured at 40 m.

swissALTIRegio 2026 · swisstopo, retrieved 28.08.2026

Solar potential

BFE

Roof potential

37.6 GWh/yr

Roofs + façades

54.6 GWh/yr

≈ households powered

8'400

38 GWh/yr01'133 GWh/yr

BFE solar factsheet ↗

Modelled roof and façade potential from the BFE solar model — the electricity these surfaces could produce, not installed capacity or what the municipality actually generates today. The household figure divides the roof potential by 4'500 kWh per year, ElCom’s reference household (consumption profile H4, a 5-room apartment).

Swiss Federal Office of Energy (SFOE), retrieved 31.08.2026

Electricity

ElCom · 2026

Tariff H4

24.88 Rp./kWh

Energy

9.67 Rp./kWh

Grid usage

9.88 Rp./kWh

Levies + grid surcharge

3.54 Rp./kWh

24.88 Rp./kWh9.6443.61

Canton median 24.88 Rp./kWhSwiss median 27.7 Rp./kWh

Network operator Services industriels de Genève

ElCom tariff comparison ↗

How this is measured

Total household electricity price for ElCom consumption profile H4 — 4'500 kWh a year, a 5-room flat with electric stove and tumble dryer — standard product, excluding VAT, for the tariff year shown. Energy, grid usage, levies to public bodies and the federal grid surcharge are included. Canton and Swiss medians are ElCom's own published figures.

2026 · Federal Electricity Commission (ElCom), retrieved 28.08.2026

Housing

BFS

Vacancy rate

0.39 %

Avg. rooms

3.1

Dwellings

8'523

Built before 19464.9%

Built since 200112.5%

0.39 %0 %12 %

Vacancy rate from the BFS vacant-dwelling count (2025); building age and room count from the Buildings and Dwellings Statistics (2024). The average room count treats the ‘6 rooms or more’ class as 6, so it is a slight lower bound. The vacancy rate is volatile for small municipalities.

Buildings and Dwellings Statistics 2024 · Federal Statistical Office (FSO), retrieved 31.08.2026 · Vacant dwellings survey 2025 · Federal Statistical Office (FSO), retrieved 31.08.2026

Accessibility

ARE · NPVM

Major centrePT 32 min · Car 19 min

AgglomerationPT 32 min · Car 19 min

Remoteness 29/45 in canton

National Passenger Transport Model (NPVM) 2025 · Federal Office for Spatial Development (ARE), retrieved 28.08.2026

Municipality

Wikidata · CC0

Head of governmentJean-Pierre Pasquier · FDP.Die Liberalen

Websiteonex.ch ↗

Wikidata · continuously updated, retrieved 31.08.2026

Rankings

Largest municipalities19'101 #6 GE · #62 CH Families & children21.3% #36 GE · #732 CH Age structure19.2% #19 GE · #1408 CH Women share52.2% #11 GE · #120 CH Foreign residents37.4% #10 GE · #110 CH Population density6'798/km² #5 GE · #8 CH Tax burden15'875 #43 GE · #1209 CH Taxes50.5% #43 GE Warmest municipalities10.9 °C #31 GE · #119 CH Sunniest municipalities47.7% #12 GE · #352 CH Rainiest municipalities899 mm #22 GE · #1951 CH Voter turnout47% #42 GE · #1935 CH Against Switzerland23% #16 GE · #386 CH Aligned with Switzerland77% #28 GE · #1128 CH SVP strongholds16.6% #24 GE · #1930 CH SP strongholds18.8% #6 GE · #555 CH Centre strongholds7.3% #40 GE · #1532 CH FDP strongholds10.1% #42 GE · #1383 CH GLP strongholds5.7% #35 GE · #1044 CH Green strongholds12.5% #35 GE · #299 CH Largest by area2.8 km² #41 GE · #1913 CH Highest municipalities429 m #24 GE · #1720 CH Remotest municipalities32 min #29 GE · #2008 CH Best-connected municipalities32 min #18 GE · #117 CH Highest peaks432 m #38 GE · #2058 CH Highest-lying municipalities413 m #27 GE · #1940 CH Greatest vertical range63 m #27 GE · #1994 CH Steepest municipalities3.4° #11 GE · #1852 CH Solar potential38 GWh #15 GE · #517 CH Cheapest electricity24.88 Rp./kWh #30 GE · #270 CH Most expensive electricity24.88 Rp./kWh #31 GE · #1852 CH

Postal codes (2)

swisstopo

Localities

swisstopo · 2

Grand-Lancy1212 Onex1213

Nearby municipalities

swisstopo

Frequently asked questions

What is the postal code of Onex?: Onex has 2 postal codes: 1212, 1213.
What is the tax rate in Onex?: The municipal tax multiplier of Onex is 50.5% (2026); canton GE levies 147.5%.
How much tax do you pay in Onex?: A single person without children pays about 15'875 CHF income tax in Onex on 100'000 CHF gross income (federal, cantonal, municipal), rank 43 of 45 in canton GE. Source: ESTV (2026).
How many residents does Onex have?: Onex has 19'101 residents (2025).
How many foreign residents live in Onex?: Onex has 7'136 foreign residents, a share of 37.36% (2025).

Map

OpenStreetMap