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

Olten

4600–4663

SO CANTON4600 4612 4663

Residents

19'265

Area

11.5 km²

Population density

1'677 pop./km²

Elevation

396 m a.s.l.

Terrain up to

689 m a.s.l.

Tax multiplier

108%

Postal codes

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

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%

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

Vote results for Olten

BFS

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

43.5% YesNo 56.5%

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

31.3% YesNo 68.7%

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

71.4% YesNo 28.6%

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

71.3% YesNo 28.7%

08.03.2026Bundesgesetz über die IndividualbesteuerungFederal● Accepted · 54.3% Yes

65.5% YesNo 34.5%

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

42.3% YesNo 57.7%

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

27.6% YesNo 72.4%

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

26.4% YesNo 73.6%

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

77.7% YesNo 22.3%

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

33.5% YesNo 66.5%

All federal votes →

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

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 31.08.2026

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 31.08.2026

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

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 31.08.2026

Electricity

ElCom · 2026

Tariff H4

30.42 Rp./kWh

Energy

13.98 Rp./kWh

Grid usage

11.39 Rp./kWh

Levies + grid surcharge

3.45 Rp./kWh

30.42 Rp./kWh9.6443.61

Canton median 30.42 Rp./kWhSwiss median 27.7 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.

2026 · Federal Electricity Commission (ElCom), retrieved 28.08.2026

Housing

BFS

Vacancy rate

2.06 %

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 31.08.2026 · Vacant dwellings survey 2025 · Federal Statistical Office (FSO), retrieved 31.08.2026

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 28.08.2026

Municipality

Wikidata · CC0

Websiteolten.ch ↗

Wikidata · continuously updated, retrieved 31.08.2026

Rankings

Largest municipalities19'265 #1 SO · #61 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 turnout54.4% #40 SO · #1155 CH Against Switzerland13.1% #37 SO · #1037 CH Aligned with Switzerland86.9% #39 SO · #421 CH SVP strongholds16% #102 SO · #1950 CH SP strongholds25.6% #5 SO · #151 CH Centre strongholds11.3% #91 SO · #1082 CH FDP strongholds15.7% #55 SO · #760 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 Remotest municipalities53 min #88 SO · #1543 CH Best-connected municipalities53 min #16 SO · #560 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 Cheapest electricity30.42 Rp./kWh #51 SO · #1743 CH Most expensive electricity30.42 Rp./kWh #54 SO · #364 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