What is the postal code of Solothurn?

The postal code of Solothurn is 4500.

What is the tax rate in Solothurn?

The municipal tax multiplier of Solothurn is 112% (2026); canton SO levies 104%.

How much tax do you pay in Solothurn?

A single person without children pays about 16'163 CHF income tax in Solothurn on 100'000 CHF gross income (federal, cantonal, municipal), rank 25 of 104 in canton SO. Source: ESTV (2026).

How many residents does Solothurn have?

Solothurn has 16'830 residents (2025).

How many foreign residents live in Solothurn?

Solothurn has 3'838 foreign residents, a share of 22.8% (2025).

Switzerland · Canton SO

Solothurn

4500

SO CANTON4500

Residents

16'830

Area

6.3 km²

Population density

2'680 pop./km²

Elevation

435 m a.s.l.

Tax multiplier

112%

Postal codes

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

Demographics

BFS · 2025

Women

8'666 51.5%

Men

8'164 48.5%

Children & youth (0–19)

2'766 16.4%

Swiss citizens

12'992 77.2%

Foreign residents

3'838 22.8%

Population density

2'680 pop./km²

0–19 · 2'766 · 16.4%20–64 · 10'373 · 61.6%65+ · 3'691 · 21.9%

Foreign residents 22.8%0%64.0%

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

Vote results for Solothurn

BFS

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

41.2% YesNo 58.8%

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

27.8% YesNo 72.2%

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

73.0% YesNo 27.0%

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

73.0% YesNo 27.0%

08.03.2026Bundesgesetz über die IndividualbesteuerungFederal● Accepted · 54.3% Yes

67.2% YesNo 32.8%

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

40.5% YesNo 59.5%

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

26.1% YesNo 73.9%

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

26.1% YesNo 73.9%

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

77.0% YesNo 23.0%

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

33.1% YesNo 66.9%

All federal votes →

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

Politics

National Council election 2023

SP27.3% · strongest party

SP27.3%

FDP19.8%

GRÜNE17.9%

SVP12.4%

Mitte10.6%

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

Taxes 2026

ESTV

Municipal tax multiplier112%

Cantonal tax multiplier104%

112%SO range 65%145%

Tax rank 25 of 104 in canton Solothurn

Tax burden

Single, 100'000 CHF gross income

16'163 CHF(16.2%)

Rank 25 of 104 in the canton · 1363 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:16'163 CHF(~16.2%)

SolothurnCanton range SolothurnSwitzerland median

Show data table

Gross income	Solothurn	Solothurn	Switzerland median
40'000	7.7%	6.1–8.8%	5.4%
50'000	9.9%	7.9–11.4%	7.8%
60'000	11.8%	9.4–13.5%	10.5%
70'000	13.2%	10.5–15.1%	11.9%
80'000	14.3%	11.5–16.3%	13.1%
90'000	15.2%	12.2–17.3%	14.1%
100'000	16.2%	13–18.4%	15.3%
110'000	17%	13.8–19.3%	16.3%
120'000	17.7%	14.4–20.1%	17.2%
130'000	18.5%	15.1–20.9%	18.1%
140'000	19.3%	15.7–21.8%	19%
150'000	20%	16.4–22.5%	19.7%
175'000	21.6%	17.8–24.3%	21.6%
200'000	23%	19.1–25.8%	23.2%
225'000	24.2%	20.1–27%	24.6%
250'000	25.2%	21.1–28.2%	25.8%
275'000	26.1%	21.9–29.1%	26.8%
300'000	26.8%	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 1991–20209.7 °C

Precipitation 1991–20201'177 mm

9.7 °CCH range -5.5°14°

1991–2020 · MeteoSwiss, retrieved 28.08.2026

Terrain

swisstopo · DHM 40 m

Highest point

500 m

Mean elevation

439 m

Relief

76 m

Mean slope

2°

Flat share

91.2%

South-facing

5.5%

Above 2000 m

0.0%

Relief 76 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

96.4 GWh/yr

Roofs + façades

129.3 GWh/yr

≈ households powered

21'400

96 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

30.66 Rp./kWh

Energy

13.93 Rp./kWh

Grid usage

11.8 Rp./kWh

Levies + grid surcharge

3.6 Rp./kWh

30.66 Rp./kWh9.6443.61

Canton median 30.42 Rp./kWhSwiss median 27.7 Rp./kWh

Network operator Regio Energie Solothurn

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

1.24 %

Avg. rooms

3.4

Dwellings

10'110

Built before 194637.7%

Built since 200112.0%

1.24 %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 60 min · Car 41 min

AgglomerationPT 14 min · Car 9 min

Remoteness 68/104 in canton

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

Municipality

Wikidata · CC0

Head of governmentKurt Fluri · FDP.Die Liberalen

Websitestadt-solothurn.ch ↗

Wikidata · continuously updated, retrieved 31.08.2026

Rankings

Largest municipalities16'830 #3 SO · #78 CH Families & children16.4% #99 SO · #1889 CH Age structure21.9% #58 SO · #873 CH Women share51.5% #6 SO · #233 CH Foreign residents22.8% #27 SO · #667 CH Population density2'680/km² #2 SO · #39 CH Tax burden16'163 #25 SO · #1363 CH Taxes112% #25 SO Warmest municipalities9.7 °C #22 SO · #795 CH Sunniest municipalities40% #97 SO · #1880 CH Rainiest municipalities1'177 mm #23 SO · #750 CH Voter turnout55.9% #28 SO · #949 CH Against Switzerland17% #24 SO · #775 CH Aligned with Switzerland83% #54 SO · #666 CH SVP strongholds12.4% #104 SO · #2058 CH SP strongholds27.3% #2 SO · #105 CH Centre strongholds10.6% #93 SO · #1140 CH FDP strongholds19.8% #31 SO · #467 CH GLP strongholds8.8% #5 SO · #465 CH Green strongholds17.9% #2 SO · #38 CH Largest by area6.3 km² #48 SO · #1356 CH Highest municipalities435 m #80 SO · #1663 CH Remotest municipalities60 min #68 SO · #1335 CH Best-connected municipalities60 min #38 SO · #775 CH Highest peaks500 m #85 SO · #1879 CH Highest-lying municipalities439 m #86 SO · #1802 CH Greatest vertical range76 m #83 SO · #1944 CH Steepest municipalities2° #93 SO · #2004 CH Solar potential96 GWh #3 SO · #89 CH Cheapest electricity30.66 Rp./kWh #57 SO · #1771 CH Most expensive electricity30.66 Rp./kWh #48 SO · #336 CH

Postal codes (1)

swisstopo

4500

Solothurn

Localities

swisstopo · 1

Solothurn4500

Nearby municipalities

swisstopo

Feldbrunnen-St. Niklaus

SO · 2.1 km

Bellach

SO · 2.1 km

Frequently asked questions

What is the postal code of Solothurn?: The postal code of Solothurn is 4500.
What is the tax rate in Solothurn?: The municipal tax multiplier of Solothurn is 112% (2026); canton SO levies 104%.
How much tax do you pay in Solothurn?: A single person without children pays about 16'163 CHF income tax in Solothurn on 100'000 CHF gross income (federal, cantonal, municipal), rank 25 of 104 in canton SO. Source: ESTV (2026).
How many residents does Solothurn have?: Solothurn has 16'830 residents (2025).
How many foreign residents live in Solothurn?: Solothurn has 3'838 foreign residents, a share of 22.8% (2025).

Map

OpenStreetMap

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