What is the postal code of Gempen?

The postal code of Gempen is 4145.

What is the tax rate in Gempen?

The municipal tax multiplier of Gempen is 117% (2026); canton SO levies 104%.

How much tax do you pay in Gempen?

A single person without children pays about 16'476 CHF income tax in Gempen on 100'000 CHF gross income (federal, cantonal, municipal), rank 37 of 104 in canton SO. Source: ESTV (2026).

How many residents does Gempen have?

Gempen has 919 residents (2025).

How many foreign residents live in Gempen?

Gempen has 151 foreign residents, a share of 16.43% (2025).

Switzerland · Canton SO

Gempen

4145

SO CANTON4145

Residents

919

Area

6 km²

Population density

153 pop./km²

Elevation

714 m a.s.l.

Tax multiplier

117%

Postal codes

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

Demographics

BFS · 2025

Women

455 49.5%

Men

464 50.5%

Children & youth (0–19)

192 20.9%

Swiss citizens

768 83.6%

Foreign residents

151 16.4%

Population density

153 pop./km²

0–19 · 192 · 20.9%20–64 · 511 · 55.6%65+ · 216 · 23.5%

Foreign residents 16.4%0%64.0%

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

Vote results for Gempen

BFS

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

49.5% YesNo 50.5%

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

45.3% YesNo 54.7%

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

58.3% YesNo 41.7%

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

58.4% YesNo 41.6%

08.03.2026Bundesgesetz über die IndividualbesteuerungFederal● Accepted · 54.3% Yes

56.4% YesNo 43.6%

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

32.8% YesNo 67.2%

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

40.8% YesNo 59.2%

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

44.7% YesNo 55.3%

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

73.2% YesNo 26.8%

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

53.3% YesNo 46.7%

All federal votes →

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

Politics

National Council election 2023

SVP28.4% · strongest party

SVP28.4%

SP19.7%

Mitte14.5%

GRÜNE13.5%

FDP12.9%

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

Taxes 2026

ESTV

Municipal tax multiplier117%

Cantonal tax multiplier104%

117%SO range 65%145%

Tax rank 39 of 104 in canton Solothurn

Tax burden

Single, 100'000 CHF gross income

16'476 CHF(16.5%)

Rank 37 of 104 in the canton · 1557 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:16'476 CHF(~16.5%)

GempenCanton range SolothurnSwitzerland median

Show data table

Gross income	Gempen	Solothurn	Switzerland median
40'000	7.8%	6.1–8.8%	5.4%
50'000	10.1%	7.9–11.4%	7.8%
60'000	12%	9.4–13.5%	10.5%
70'000	13.4%	10.5–15.1%	11.9%
80'000	14.6%	11.5–16.3%	13.1%
90'000	15.5%	12.2–17.3%	14.1%
100'000	16.5%	13–18.4%	15.3%
110'000	17.3%	13.8–19.3%	16.3%
120'000	18.1%	14.4–20.1%	17.2%
130'000	18.9%	15.1–20.9%	18.1%
140'000	19.6%	15.7–21.8%	19%
150'000	20.3%	16.4–22.5%	19.7%
175'000	22%	17.8–24.3%	21.6%
200'000	23.4%	19.1–25.8%	23.2%
225'000	24.6%	20.1–27%	24.6%
250'000	25.7%	21.1–28.2%	25.8%
275'000	26.5%	21.9–29.1%	26.8%
300'000	27.3%	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 1991–20208.9 °C

Precipitation 1991–20201'041 mm

8.9 °CCH range -5.5°14°

1991–2020 · MeteoSwiss, retrieved 28.08.2026

Terrain

swisstopo · DHM 40 m

Highest point

759 m

Mean elevation

676 m

Relief

203 m

Mean slope

7.6°

Flat share

42.9%

South-facing

11.0%

Above 2000 m

0.0%

Relief 203 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

8.9 GWh/yr

Roofs + façades

11.5 GWh/yr

≈ households powered

2'000

9 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

31.98 Rp./kWh

Energy

13.73 Rp./kWh

Grid usage

14.26 Rp./kWh

Levies + grid surcharge

2.92 Rp./kWh

31.98 Rp./kWh9.6443.61

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

Network operator Primeo Netz AG

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

1.8 %

Avg. rooms

4.3

Dwellings

444

Built before 194622.1%

Built since 200128.4%

1.8 %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 49 min · Car 28 min

AgglomerationPT 49 min · Car 28 min

Remoteness 91/104 in canton

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

Municipality

Wikidata · CC0

Websitegempen.ch ↗

Wikidata · continuously updated, retrieved 31.08.2026

Rankings

Largest municipalities919 #81 SO · #1506 CH Families & children20.9% #23 SO · #845 CH Age structure23.5% #34 SO · #582 CH Women share49.5% #61 SO · #1266 CH Foreign residents16.4% #44 SO · #1168 CH Population density153/km² #77 SO · #1210 CH Tax burden16'476 #37 SO · #1557 CH Taxes117% #39 SO Warmest municipalities8.9 °C #87 SO · #1424 CH Sunniest municipalities41.1% #16 SO · #1367 CH Rainiest municipalities1'041 mm #94 SO · #1431 CH Voter turnout56.4% #24 SO · #882 CH SVP strongholds28.4% #79 SO · #1370 CH SP strongholds19.7% #18 SO · #486 CH Centre strongholds14.5% #74 SO · #856 CH FDP strongholds12.9% #80 SO · #1038 CH GLP strongholds6.4% #34 SO · #877 CH Green strongholds13.5% #7 SO · #215 CH Largest by area6 km² #50 SO · #1395 CH Highest municipalities714 m #5 SO · #575 CH Remotest municipalities49 min #91 SO · #1669 CH Best-connected municipalities49 min #13 SO · #431 CH Highest peaks759 m #44 SO · #1061 CH Highest-lying municipalities676 m #23 SO · #817 CH Greatest vertical range203 m #58 SO · #1350 CH Steepest municipalities7.6° #54 SO · #1154 CH Solar potential9 GWh #77 SO · #1623 CH Cheapest electricity31.98 Rp./kWh #65 SO · #1871 CH Most expensive electricity31.98 Rp./kWh #24 SO · #197 CH

Postal codes (1)

swisstopo

4145

Gempen

Localities

swisstopo · 1

Gempen4145

Nearby municipalities

swisstopo

Frequently asked questions

What is the postal code of Gempen?: The postal code of Gempen is 4145.
What is the tax rate in Gempen?: The municipal tax multiplier of Gempen is 117% (2026); canton SO levies 104%.
How much tax do you pay in Gempen?: A single person without children pays about 16'476 CHF income tax in Gempen on 100'000 CHF gross income (federal, cantonal, municipal), rank 37 of 104 in canton SO. Source: ESTV (2026).
How many residents does Gempen have?: Gempen has 919 residents (2025).
How many foreign residents live in Gempen?: Gempen has 151 foreign residents, a share of 16.43% (2025).

Map

OpenStreetMap

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