What is the postal code of Olten?

Olten has 3 postal codes: 4600, 4612, 4663.

What is the tax rate in Olten?

The municipal tax multiplier of Olten is 108% (2026); canton SO levies 104%.

How much tax do you pay in Olten?

A single person without children pays about 15'926 CHF income tax in Olten on 100'000 CHF gross income (federal, cantonal, municipal), rank 15 of 104 in canton SO. Source: ESTV (2026).

How many residents does Olten have?

Olten has 19'265 residents (2025).

How many foreign residents live in Olten?

Olten has 6'252 foreign residents, a share of 32.45% (2025).

Switzerland · Canton SO · Bezirk Olten

Olten

4600–4663

SO CANTON4600 4612 4663

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

Demographics

BFS · 2025

Women

9'696 50.3%

Men

9'569 49.7%

Children & youth (0–19)

3'293 17.1%

Swiss citizens

13'013 67.6%

Foreign residents

6'252 32.5%

Population density

1'677 pop./km²

0–19 · 3'293 · 17.1%20–64 · 12'308 · 63.9%65+ · 3'664 · 19.0%

Foreign residents 32.5%0%64.0%

Population change 2025: +214 (+1.1%) · 214 births · 204 deaths · net migration +234

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 Olten

BFS

27.09.2026Popular Initiative 'For food security – through increased sustainable domestic production, more plant-based food and clean drinking water (Food Initiative)'Federal● Rejected · 27.5% YesDistrict Bezirk Olten: 27.9% Yes

37.1% YesNo 62.9%

27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% YesDistrict Bezirk Olten: 25.3% Yes

18.1% YesNo 81.9%

14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% YesDistrict Bezirk Olten: 53.2% Yes

43.5% YesNo 56.5%

14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% YesDistrict Bezirk Olten: 46.7% Yes

31.3% YesNo 68.7%

14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung des KantonsratsgesetzesCantonal SO● Accepted · 58.6% YesDistrict Bezirk Olten: 62.8% Yes

71.4% YesNo 28.6%

14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung der KantonsverfassungCantonal SO● Accepted · 58.7% YesDistrict Bezirk Olten: 62.8% Yes

71.3% YesNo 28.7%

08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% YesDistrict Bezirk Olten: 56.6% Yes

65.5% YesNo 34.5%

08.03.2026Popular Initiative ‘For a fair energy and climate policy: Investing for prosperity, jobs and the environment (Climate Fund Initiative)’Federal● Rejected · 29.3% YesDistrict Bezirk Olten: 28.5% Yes

42.3% YesNo 57.7%

08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% YesDistrict Bezirk Olten: 36.7% Yes

27.6% YesNo 72.4%

08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% YesDistrict Bezirk Olten: 35.8% Yes

26.4% YesNo 73.6%

All federal votes →

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

Politics

National Council election 2023

SP25.6% · strongest party

SP25.6%

GRÜNE19.5%

SVP16.0%

FDP15.7%

Mitte11.3%

sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 25.09.2026

Taxes 2026

ESTV

Municipal tax multiplier108%

Cantonal tax multiplier104%

108%SO range 65%145%

Tax rank 14 of 104 in canton Solothurn

Tax burden

Single, 100'000 CHF gross income

15'926 CHF(15.9%)

Rank 15 of 104 in the canton · 1246 of 2110 in Switzerland

Median canton 16'810 CHF · median Switzerland 15'290 CHF

Cheapest Kammersrohr 13'027 CHF · most expensive Bolken 18'375 CHF

Income tax as % of gross income

100'000 CHF:15'926 CHF(~15.9%)

OltenCanton range SolothurnSwitzerland median

Show data table

Gross income	Olten	Solothurn	Switzerland median
40'000	7.6%	6.1–8.8%	5.4%
50'000	9.8%	7.9–11.4%	7.8%
60'000	11.6%	9.4–13.5%	10.5%
70'000	13%	10.5–15.1%	11.9%
80'000	14.1%	11.5–16.3%	13.1%
90'000	14.9%	12.2–17.3%	14.1%
100'000	15.9%	13–18.4%	15.3%
110'000	16.8%	13.8–19.3%	16.3%
120'000	17.5%	14.4–20.1%	17.2%
130'000	18.2%	15.1–20.9%	18.1%
140'000	19%	15.7–21.8%	19%
150'000	19.7%	16.4–22.5%	19.7%
175'000	21.3%	17.8–24.3%	21.6%
200'000	22.7%	19.1–25.8%	23.2%
225'000	23.9%	20.1–27%	24.6%
250'000	24.9%	21.1–28.2%	25.8%
275'000	25.8%	21.9–29.1%	26.8%
300'000	26.5%	22.5–29.8%	27.4%

2026 · Federal Tax Administration (FTA), retrieved 24.09.2026

Climate

MeteoSwiss 1 km grid · 1991–2020

Annual mean temperature 1991–20209.5 °C

Precipitation 1991–20201'066 mm

9.5 °CCH range -5.5°14°

1991–2020 · MeteoSwiss, retrieved 28.08.2026

Terrain

swisstopo · DHM 40 m

Highest point

689 m

Mean elevation

446 m

Relief

308 m

Mean slope

9°

Flat share

43.2%

South-facing

17.5%

Above 2000 m

0.0%

Relief 308 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

104.5 GWh/yr

Roofs + façades

137.1 GWh/yr

≈ households powered

23'200

Per inhabitant

5'426 kWh/yr

105 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

29.73 Rp./kWh

Energy

13.08 Rp./kWh

Grid usage

11.61 Rp./kWh

Levies + grid surcharge

3.45 Rp./kWh

29.73 Rp./kWh10.5645.88

Canton median 28.51 Rp./kWhSwiss median 26.53 Rp./kWh

Network operator Städtische Betriebe Olten (SBO)

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 300606 CHF/mo

Ø premium in canton Solothurn424 CHF/mo

Estimate Switzerland 2026465.3 CHF/mo

Compare health insurers in Olten →Canton Solothurn →Premiums explained →

Premiums are set not per municipality but per canton and premium region. Shown is the average adult premium paid in canton Solothurn (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

2.06 %

Second homes

12.6 %

Avg. rooms

3.3

Dwellings

11'003

Built before 194631.6%

Built since 200114.7%

2.06 %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

23'566

Workplaces

1'771

Services share

91 %

Jobs by sector: Primary 8 (0.0%) · Secondary 2'105 (8.9%) · Tertiary 21'453 (91.0%)

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

Agriculture

BFS · 2025

Farms

Organic share

0 %

Farmland

90 ha

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

Accessibility

ARE · NPVM

Major centrePT 53 min · Car 49 min

AgglomerationPT 13 min · Car 8 min

Remoteness 88/104 in canton

National Passenger Transport Model (NPVM) 2025 · Federal Office for Spatial Development (ARE), retrieved 24.09.2026

Municipality

Wikidata · CC0

BFS municipality number2581

Websiteolten.ch ↗

DistrictBezirk Olten

Wikidata · continuously updated, retrieved 24.09.2026

Where Olten ranks

Largest municipalities19'265 #1 SO · #61 CH Growing municipalities1.1% #32 SO · #726 CH Shrinking municipalities1.1% #73 SO · #1379 CH Jobs per resident1.22 #3 SO · #58 CH Families & children17.1% #94 SO · #1805 CH Age structure19% #91 SO · #1435 CH Women share50.3% #37 SO · #729 CH Foreign residents32.5% #13 SO · #220 CH Population density1'677/km² #5 SO · #100 CH Tax burden15'926 #15 SO · #1246 CH Taxes108% #14 SO Warmest municipalities9.5 °C #47 SO · #976 CH Sunniest municipalities40.1% #87 SO · #1812 CH Rainiest municipalities1'066 mm #85 SO · #1291 CH Voter turnout55% #43 SO · #1207 CH Against Switzerland12.9% #37 SO · #1037 CH Aligned with Switzerland87.1% #39 SO · #421 CH SVP strongholds16% #102 SO · #1953 CH SP strongholds25.6% #5 SO · #152 CH Centre strongholds11.3% #91 SO · #1086 CH FDP strongholds15.7% #55 SO · #761 CH GLP strongholds8.8% #4 SO · #464 CH Green strongholds19.5% #1 SO · #29 CH Largest by area11.5 km² #20 SO · #854 CH Highest municipalities396 m #96 SO · #1912 CH Second homes12.6% #18 SO · #827 CH Organic farming0% #96 SO · #1780 CH Best-connected municipalities53 min #16 SO · #560 CH Remotest municipalities53 min #88 SO · #1543 CH Highest peaks689 m #51 SO · #1242 CH Highest-lying municipalities446 m #82 SO · #1749 CH Greatest vertical range308 m #48 SO · #980 CH Steepest municipalities9° #49 SO · #1013 CH Solar potential105 GWh #2 SO · #75 CH Solar potential per capita5'426 kWh #102 SO · #1914 CH Cheapest electricity29.73 Rp./kWh #56 SO · #1729 CH Most expensive electricity29.73 Rp./kWh #49 SO · #378 CH

Postal codes (3)

swisstopo

Localities

swisstopo · 3

Aarburg4663 Olten4600 Wangen b. Olten4612

Nearby municipalities

swisstopo

Frequently asked questions

What is the postal code of Olten?: Olten has 3 postal codes: 4600, 4612, 4663.
What is the tax rate in Olten?: The municipal tax multiplier of Olten is 108% (2026); canton SO levies 104%.
How much tax do you pay in Olten?: A single person without children pays about 15'926 CHF income tax in Olten on 100'000 CHF gross income (federal, cantonal, municipal), rank 15 of 104 in canton SO. Source: ESTV (2026).
How many residents does Olten have?: Olten has 19'265 residents (2025).
How many foreign residents live in Olten?: Olten has 6'252 foreign residents, a share of 32.45% (2025).

Map

OpenStreetMap