Demographics
BFS · 2025Women
522 51.0%
Men
501 49.0%
Children & youth (0–19)
168 16.4%
Swiss citizens
872 85.2%
Foreign residents
151 14.8%
Population density
329 pop./km²
0–19 · 168 · 16.4%20–64 · 641 · 62.7%65+ · 214 · 20.9%
Foreign residents 14.8%0%64.0%
Population change 2025: −29 (−2.8%) · 10 births · 11 deaths · net migration −29
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
24.8% YesNo 75.2%
27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% YesDistrict Bezirk Lebern: 25.8% Yes
30.7% YesNo 69.3%
14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% YesDistrict Bezirk Lebern: 56.1% Yes
59.0% YesNo 41.0%
14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% YesDistrict Bezirk Lebern: 51.8% Yes
63.4% YesNo 36.6%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung des KantonsratsgesetzesCantonal SO● Accepted · 58.6% YesDistrict Bezirk Lebern: 58.3% Yes
51.2% YesNo 48.8%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung der KantonsverfassungCantonal SO● Accepted · 58.7% YesDistrict Bezirk Lebern: 58.3% Yes
51.2% YesNo 48.8%
08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% YesDistrict Bezirk Lebern: 55.1% Yes
59.0% YesNo 41.0%
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
22.6% YesNo 77.4%
08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% YesDistrict Bezirk Lebern: 40.7% Yes
44.1% YesNo 55.9%
08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% YesDistrict Bezirk Lebern: 38.2% Yes
44.4% YesNo 55.6%
Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 04.10.2026
Politics
National Council election 2023SVP34.1% · strongest party
SVP34.1%
SP18.8%
FDP18.6%
Mitte12.6%
GRÜNE7.8%
sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 25.09.2026
Taxes 2026
ESTVMunicipal tax multiplier125%
Cantonal tax multiplier104%
125%SO range 65%145%
Tax rank 79 of 104 in canton SolothurnTax burden
Single, 100'000 CHF gross income
17'060 CHF(17.1%)
Rank 81 of 104 in the canton · 1884 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:17'060 CHF(~17.1%)
FlumenthalCanton range SolothurnSwitzerland median
Show data table
| Gross income | Flumenthal | Solothurn | Switzerland median |
|---|---|---|---|
| 40'000 | 8.2% | 6.1–8.8% | 5.4% |
| 50'000 | 10.5% | 7.9–11.4% | 7.8% |
| 60'000 | 12.5% | 9.4–13.5% | 10.5% |
| 70'000 | 14% | 10.5–15.1% | 11.9% |
| 80'000 | 15.1% | 11.5–16.3% | 13.1% |
| 90'000 | 16% | 12.2–17.3% | 14.1% |
| 100'000 | 17.1% | 13–18.4% | 15.3% |
| 110'000 | 17.9% | 13.8–19.3% | 16.3% |
| 120'000 | 18.7% | 14.4–20.1% | 17.2% |
| 130'000 | 19.5% | 15.1–20.9% | 18.1% |
| 140'000 | 20.3% | 15.7–21.8% | 19% |
| 150'000 | 21% | 16.4–22.5% | 19.7% |
| 175'000 | 22.7% | 17.8–24.3% | 21.6% |
| 200'000 | 24.1% | 19.1–25.8% | 23.2% |
| 225'000 | 25.3% | 20.1–27% | 24.6% |
| 250'000 | 26.4% | 21.1–28.2% | 25.8% |
| 275'000 | 27.3% | 21.9–29.1% | 26.8% |
| 300'000 | 28% | 22.5–29.8% | 27.4% |
2026 · Federal Tax Administration (FTA), retrieved 24.09.2026
Climate
MeteoSwiss 1 km grid · 1991–2020Annual mean temperature 1991–20209.6 °C
Precipitation 1991–20201'156 mm
9.6 °CCH range -5.5°14°
1991–2020 · MeteoSwiss, retrieved 28.08.2026
Terrain
swisstopo · DHM 40 mHighest point
490 m
Mean elevation
441 m
Relief
72 m
Mean slope
3.6°
Flat share
75.9%
South-facing
12.6%
Above 2000 m
0.0%
Relief 72 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
10.5 GWh/yr
Roofs + façades
13.7 GWh/yr
≈ households powered
2'300
Per inhabitant
10'254 kWh/yr
10 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
25.19 Rp./kWh
Energy
7.97 Rp./kWh
Grid usage
11.91 Rp./kWh
Levies + grid surcharge
3.4 Rp./kWh
25.19 Rp./kWh10.5645.88
Canton median 28.51 Rp./kWhSwiss median 26.53 Rp./kWh
Network operator BKW Energie 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.
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
1.69 %
Second homes
6.2 %
Avg. rooms
4.1
Dwellings
533
Built before 194629.6%
Built since 200114.4%
1.69 %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
430
Workplaces
69
Services share
79.1 %
Jobs by sector: Primary 16 (3.7%) · Secondary 74 (17.2%) · Tertiary 340 (79.1%)
STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026
Agriculture
BFS · 2025Farms
7
Organic share
0 %
Farmland
149 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 municipalities1'023 #75 SO · #1444 CHGrowing municipalities-2.8% #101 SO · #2043 CHShrinking municipalities-2.8% #4 SO · #66 CHJobs per resident0.42 #32 SO · #765 CHFamilies & children16.4% #98 SO · #1888 CHAge structure20.9% #71 SO · #1060 CHWomen share51% #15 SO · #391 CHForeign residents14.8% #56 SO · #1300 CHPopulation density329/km² #46 SO · #718 CHTax burden17'060 #81 SO · #1884 CHTaxes125% #79 SOWarmest municipalities9.6 °C #33 SO · #883 CHSunniest municipalities40.2% #71 SO · #1740 CHRainiest municipalities1'156 mm #27 SO · #818 CHVoter turnout49.5% #86 SO · #1816 CHAgainst Switzerland18.8% #16 SO · #585 CHAligned with Switzerland81.2% #60 SO · #869 CHSVP strongholds34.1% #39 SO · #1032 CHSP strongholds18.8% #23 SO · #553 CHCentre strongholds12.6% #85 SO · #989 CHFDP strongholds18.6% #35 SO · #548 CHGLP strongholds5.4% #57 SO · #1106 CHGreen strongholds7.8% #40 SO · #916 CHLargest by area3.1 km² #86 SO · #1849 CHHighest municipalities430 m #85 SO · #1705 CHSecond homes6.2% #95 SO · #1943 CHOrganic farming0% #85 SO · #1769 CHBest-connected municipalities71 min #80 SO · #1113 CHRemotest municipalities71 min #26 SO · #1000 CHHighest peaks490 m #90 SO · #1913 CHHighest-lying municipalities441 m #85 SO · #1791 CHGreatest vertical range72 m #84 SO · #1954 CHSteepest municipalities3.6° #82 SO · #1819 CHSolar potential10 GWh #74 SO · #1518 CHSolar potential per capita10'254 kWh #39 SO · #1030 CHCheapest electricity25.19 Rp./kWh #13 SO · #471 CHMost expensive electricity25.19 Rp./kWh #94 SO · #1639 CH
Postal codes (2)
swisstopoLocalities
swisstopo · 2Nearby municipalities
swisstopo- What is the postal code of Flumenthal?
- Flumenthal has 2 postal codes: 4534, 4543.
- What is the tax rate in Flumenthal?
- The municipal tax multiplier of Flumenthal is 125% (2026); canton SO levies 104%.
- How much tax do you pay in Flumenthal?
- A single person without children pays about 17'060 CHF income tax in Flumenthal on 100'000 CHF gross income (federal, cantonal, municipal), rank 81 of 104 in canton SO. Source: ESTV (2026).
- How many residents does Flumenthal have?
- Flumenthal has 1'023 residents (2025).
- How many foreign residents live in Flumenthal?
- Flumenthal has 151 foreign residents, a share of 14.76% (2025).
Map
OpenStreetMapFlumenthal compared with
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