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

Relief © swisstopo · TINITALY · geoland.at · LGL · IGN · swissTLM3D · swissTLMRegio

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%

Population change 2025: +186 (+1%) · 161 births · 185 deaths · net migration +318

STATPOP 2025 · Federal Statistical Office (FSO), retrieved 19.09.2026 · swisstopo, retrieved 24.09.2026 · BEVNAT (Statistik der natürlichen Bevölkerungsbewegung) 2025 · Federal Statistical Office (FSO), retrieved 24.09.2026

Vote results for Onex

BFS

37.4% YesNo 62.6%

27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% Yes

37.8% YesNo 62.2%

27.09.2026Loi 13579 indemnité à la Haute école spécialisée de Suisse occidentale – GenèveCantonal GE● Rejected · 41.5% Yes

37.5% YesNo 62.5%

27.09.2026Loi 13025 LDTR pour que les locataires puissent devenir, s’ils le souhaitent, propriétaires de leur propre logementCantonal GE● Rejected · 36.5% Yes

33.7% YesNo 66.4%

27.09.2026Loi 13725 crédit de 39 500 000 francs pour la réalisation de projets transfrontaliersCantonal GE● Accepted · 56.8% Yes

47.7% YesNo 52.3%

27.09.2026IN 198 « Pour une contraception gratuite »Cantonal GE● Accepted · 58.5% Yes

59.1% YesNo 40.9%

14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% Yes

42.0% YesNo 58.0%

14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% Yes

41.3% YesNo 58.8%

14.06.2026Loi sur les heures d'ouverture des magasins (LHOM) (Ouverture du dimanche)Cantonal GE● Accepted · 52.8% Yes

49.6% YesNo 50.4%

14.06.2026Loi pour une expression non ostentatoire des convictions religieusesCantonal GE● Accepted · 51.4% Yes

49.9% YesNo 50.1%

All federal votes →

Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 04.10.2026

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 25.09.2026

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 24.09.2026

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

Per inhabitant

1'967 kWh/yr

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 24.09.2026

Electricity

ElCom · 2027

Tariff H4

24.43 Rp./kWh

Energy

9.33 Rp./kWh

Grid usage

9.78 Rp./kWh

Levies + grid surcharge

3.54 Rp./kWh

24.43 Rp./kWh10.5645.88

Canton median 24.43 Rp./kWhSwiss median 26.53 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.

2027 · Federal Electricity Commission (ElCom), retrieved 12.09.2026

Health-insurance premiums

BAG · 2024

Standard model, deductible 300752 CHF/mo

Ø premium in canton Geneva539 CHF/mo

Estimate Switzerland 2026465.3 CHF/mo

Compare health insurers in Onex →Canton Geneva →Premiums explained →

Premiums are set not per municipality but per canton and premium region. Shown is the average adult premium paid in canton Geneva (2024, BAG) — it applies canton-wide, not to any single location.

2024 · Federal Office of Public Health (FOPH), retrieved 12.09.2026

Housing

BFS · ARE

Vacancy rate

0.39 %

Second homes

8.9 %

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 24.09.2026 · Vacant dwellings survey 2025 · Federal Statistical Office (FSO), retrieved 24.09.2026 · Dwelling inventory and second-home share 2026 · Federal Office for Spatial Development (ARE), retrieved 24.09.2026

Economy

BFS · 2024

Jobs

5'094

Workplaces

746

Services share

84 %

Jobs by sector: Primary 27 (0.5%) · Secondary 789 (15.5%) · Tertiary 4'278 (84.0%)

STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026

Agriculture

BFS · 2025

Farms

Organic share

25 %

Farmland

9 ha

Landwirtschaftliche Strukturerhebung 2025 · Federal Statistical Office (FSO), retrieved 19.09.2026

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 24.09.2026

Municipality

Wikidata · CC0

BFS municipality number6631

Head of governmentJean-Pierre Pasquier · FDP.Die Liberalen

Websiteonex.ch ↗

Wikidata · continuously updated, retrieved 24.09.2026

Where Onex ranks

Largest municipalities19'101 #6 GE · #62 CH Growing municipalities1% #21 GE · #820 CH Shrinking municipalities1% #26 GE · #1300 CH Jobs per resident0.27 #29 GE · #1459 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 turnout48% #42 GE · #1922 CH Against Switzerland22.5% #16 GE · #387 CH Aligned with Switzerland77.5% #28 GE · #1123 CH SVP strongholds16.6% #24 GE · #1933 CH SP strongholds18.8% #6 GE · #558 CH Centre strongholds7.3% #40 GE · #1535 CH FDP strongholds10.1% #42 GE · #1387 CH GLP strongholds5.7% #35 GE · #1046 CH Green strongholds12.5% #35 GE · #301 CH Largest by area2.8 km² #41 GE · #1913 CH Highest municipalities429 m #24 GE · #1720 CH Second homes8.9% #41 GE · #1408 CH Organic farming25% #19 GE · #488 CH Best-connected municipalities32 min #18 GE · #117 CH Remotest municipalities32 min #29 GE · #2008 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 Solar potential per capita1'967 kWh #45 GE · #2107 CH Cheapest electricity24.43 Rp./kWh #30 GE · #308 CH Most expensive electricity24.43 Rp./kWh #31 GE · #1814 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