Demographics
BFS · 2025Women
9'382 49.4%
Men
9'591 50.6%
Children & youth (0–19)
3'437 18.1%
Swiss citizens
11'216 59.1%
Foreign residents
7'757 40.9%
Population density
729 pop./km²
0–19 · 3'437 · 18.1%20–64 · 11'346 · 59.8%65+ · 4'190 · 22.1%
Foreign residents 40.9%0%64.0%
Population change 2025: +371 (+2%) · 170 births · 204 deaths · net migration +407
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
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 Lebern: 24.2% Yes
24.5% YesNo 75.5%
27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% YesDistrict Bezirk Lebern: 25.8% Yes
28.9% YesNo 71.1%
14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% YesDistrict Bezirk Lebern: 56.1% Yes
57.1% YesNo 42.9%
14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% YesDistrict Bezirk Lebern: 51.8% Yes
56.4% YesNo 43.6%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung des KantonsratsgesetzesCantonal SO● Accepted · 58.6% YesDistrict Bezirk Lebern: 58.3% Yes
57.8% YesNo 42.3%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung der KantonsverfassungCantonal SO● Accepted · 58.7% YesDistrict Bezirk Lebern: 58.3% Yes
57.6% YesNo 42.4%
08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% YesDistrict Bezirk Lebern: 55.1% Yes
55.2% YesNo 44.8%
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 Lebern: 23.1% Yes
22.1% YesNo 77.9%
08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% YesDistrict Bezirk Lebern: 40.7% Yes
46.5% YesNo 53.5%
08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% YesDistrict Bezirk Lebern: 38.2% Yes
43.5% YesNo 56.5%
Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 04.10.2026
Politics
National Council election 2023SVP38.5% · strongest party
SVP38.5%
SP20.7%
FDP14.4%
Mitte12.7%
GRÜNE5.6%
sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 25.09.2026
Taxes 2026
ESTVMunicipal tax multiplier114.9%
Cantonal tax multiplier104%
114.9%SO range 65%145%
Tax rank 32 of 104 in canton SolothurnTax burden
Single, 100'000 CHF gross income
16'386 CHF(16.4%)
Rank 34 of 104 in the canton · 1497 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
100'000 CHF:16'386 CHF(~16.4%)
GrenchenCanton range SolothurnSwitzerland median
Show data table
| Gross income | Grenchen | 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 | 14.5% | 11.5–16.3% | 13.1% |
| 90'000 | 15.4% | 12.2–17.3% | 14.1% |
| 100'000 | 16.4% | 13–18.4% | 15.3% |
| 110'000 | 17.2% | 13.8–19.3% | 16.3% |
| 120'000 | 18% | 14.4–20.1% | 17.2% |
| 130'000 | 18.7% | 15.1–20.9% | 18.1% |
| 140'000 | 19.5% | 15.7–21.8% | 19% |
| 150'000 | 20.2% | 16.4–22.5% | 19.7% |
| 175'000 | 21.9% | 17.8–24.3% | 21.6% |
| 200'000 | 23.3% | 19.1–25.8% | 23.2% |
| 225'000 | 24.5% | 20.1–27% | 24.6% |
| 250'000 | 25.5% | 21.1–28.2% | 25.8% |
| 275'000 | 26.4% | 21.9–29.1% | 26.8% |
| 300'000 | 27.1% | 22.5–29.8% | 27.4% |
2026 · Federal Tax Administration (FTA), retrieved 24.09.2026
Climate
MeteoSwiss 1 km grid · 1991–2020Annual mean temperature 1991–20209.5 °C
Precipitation 1991–20201'372 mm
9.5 °CCH range -5.5°14°
1991–2020 · MeteoSwiss, retrieved 28.08.2026
Terrain
swisstopo · DHM 40 mHighest point
1'399 m
Mean elevation
720 m
Relief
976 m
Mean slope
10.3°
Flat share
44.2%
South-facing
38.5%
Above 2000 m
0.0%
Relief 976 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
Roof potential
115 GWh/yr
Roofs + façades
153 GWh/yr
≈ households powered
25'600
Per inhabitant
6'061 kWh/yr
115 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 · 2027Tariff H4
27.1 Rp./kWh
Energy
12.15 Rp./kWh
Grid usage
10.04 Rp./kWh
Levies + grid surcharge
3.42 Rp./kWh
27.1 Rp./kWh10.5645.88
Canton median 28.51 Rp./kWhSwiss median 26.53 Rp./kWh
Network operator SWG
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 · 2024Standard model, deductible 300606 CHF/mo
Ø premium in canton Solothurn424 CHF/mo
Estimate Switzerland 2026465.3 CHF/mo
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 · AREVacancy rate
1.27 %
Second homes
14.8 %
Avg. rooms
3.4
Dwellings
10'507
Built before 194620.2%
Built since 200116.0%
1.27 %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 · 2024Jobs
10'684
Workplaces
1'029
Services share
51.5 %
Jobs by sector: Primary 97 (0.9%) · Secondary 5'084 (47.6%) · Tertiary 5'503 (51.5%)
STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026
Agriculture
BFS · 2025Farms
27
Organic share
7.4 %
Farmland
736 ha
Landwirtschaftliche Strukturerhebung 2025 · Federal Statistical Office (FSO), retrieved 19.09.2026
Accessibility
ARE · NPVMNational Passenger Transport Model (NPVM) 2025 · Federal Office for Spatial Development (ARE), retrieved 24.09.2026
Municipality
Wikidata · CC0Wikidata · continuously updated, retrieved 24.09.2026
Largest municipalities18'973 #2 SO · #63 CHGrowing municipalities2% #17 SO · #352 CHShrinking municipalities2% #88 SO · #1756 CHJobs per resident0.56 #13 SO · #403 CHFamilies & children18.1% #81 SO · #1650 CHAge structure22.1% #53 SO · #837 CHWomen share49.4% #66 SO · #1320 CHForeign residents40.9% #5 SO · #69 CHPopulation density729/km² #18 SO · #342 CHTax burden16'386 #34 SO · #1497 CHTaxes114.9% #32 SOWarmest municipalities9.5 °C #46 SO · #975 CHSunniest municipalities40.5% #47 SO · #1607 CHRainiest municipalities1'372 mm #9 SO · #394 CHVoter turnout42.9% #103 SO · #2079 CHAgainst Switzerland9.9% #53 SO · #1193 CHAligned with Switzerland90.1% #23 SO · #262 CHSVP strongholds38.5% #16 SO · #740 CHSP strongholds20.7% #17 SO · #415 CHCentre strongholds12.7% #83 SO · #979 CHFDP strongholds14.4% #63 SO · #881 CHGLP strongholds5% #66 SO · #1192 CHGreen strongholds5.6% #75 SO · #1423 CHLargest by area26 km² #2 SO · #347 CHHighest municipalities451 m #71 SO · #1525 CHSecond homes14.8% #8 SO · #591 CHOrganic farming7.4% #64 SO · #1401 CHBest-connected municipalities69 min #73 SO · #1055 CHRemotest municipalities69 min #33 SO · #1057 CHHighest peaks1'399 m #2 SO · #500 CHHighest-lying municipalities720 m #18 SO · #722 CHGreatest vertical range976 m #2 SO · #451 CHSteepest municipalities10.3° #44 SO · #896 CHSolar potential115 GWh #1 SO · #59 CHSolar potential per capita6'061 kWh #98 SO · #1827 CHCheapest electricity27.1 Rp./kWh #36 SO · #1133 CHMost expensive electricity27.1 Rp./kWh #69 SO · #974 CH
Postal codes (1)
swisstopoLocalities
swisstopo · 1Nearby municipalities
swisstopo- What is the postal code of Grenchen?
- The postal code of Grenchen is 2540.
- What is the tax rate in Grenchen?
- The municipal tax multiplier of Grenchen is 114.9% (2026); canton SO levies 104%.
- How much tax do you pay in Grenchen?
- A single person without children pays about 16'386 CHF income tax in Grenchen on 100'000 CHF gross income (federal, cantonal, municipal), rank 34 of 104 in canton SO. Source: ESTV (2026).
- How many residents does Grenchen have?
- Grenchen has 18'973 residents (2025).
- How many foreign residents live in Grenchen?
- Grenchen has 7'757 foreign residents, a share of 40.88% (2025).
Map
OpenStreetMapGrenchen compared with
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