Demographics
BFS · 2025Women
275 47.5%
Men
304 52.5%
Children & youth (0–19)
113 19.5%
Swiss citizens
534 92.2%
Foreign residents
45 7.8%
Population density
273 pop./km²
0–19 · 113 · 19.5%20–64 · 350 · 60.4%65+ · 116 · 20.0%
Foreign residents 7.8%0%64.0%
Population change 2025: +2 (+0.4%) · 6 births · 2 deaths · net migration −1
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 Wasseramt: 24.2% Yes
22.5% YesNo 77.5%
27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% YesDistrict Bezirk Wasseramt: 25.9% Yes
32.4% YesNo 67.6%
14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% YesDistrict Bezirk Wasseramt: 54.5% Yes
57.0% YesNo 43.0%
14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% YesDistrict Bezirk Wasseramt: 50.5% Yes
63.4% YesNo 36.6%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung des KantonsratsgesetzesCantonal SO● Accepted · 58.6% YesDistrict Bezirk Wasseramt: 58.2% Yes
52.2% YesNo 47.8%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung der KantonsverfassungCantonal SO● Accepted · 58.7% YesDistrict Bezirk Wasseramt: 58.4% Yes
52.2% YesNo 47.8%
08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% YesDistrict Bezirk Wasseramt: 54.4% Yes
48.6% YesNo 51.4%
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 Wasseramt: 24.0% Yes
18.9% YesNo 81.2%
08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% YesDistrict Bezirk Wasseramt: 40.5% Yes
41.9% YesNo 58.1%
08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% YesDistrict Bezirk Wasseramt: 39.9% Yes
36.4% YesNo 63.6%
Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 04.10.2026
Politics
National Council election 2023SVP40.1% · strongest party
SVP40.1%
SP16.8%
Mitte15.0%
FDP10.8%
GLP8.2%
sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 25.09.2026
Taxes 2026
ESTVMunicipal tax multiplier145%
Cantonal tax multiplier104%
145%SO range 65%145%
Tax rank 104 of 104 in canton SolothurnTax burden
Single, 100'000 CHF gross income
18'375 CHF(18.4%)
Rank 104 of 104 in the canton · 2095 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:18'375 CHF(~18.4%)
BolkenCanton range SolothurnSwitzerland median
Show data table
| Gross income | Bolken | Solothurn | Switzerland median |
|---|---|---|---|
| 40'000 | 8.8% | 6.1–8.8% | 5.4% |
| 50'000 | 11.4% | 7.9–11.4% | 7.8% |
| 60'000 | 13.5% | 9.4–13.5% | 10.5% |
| 70'000 | 15.1% | 10.5–15.1% | 11.9% |
| 80'000 | 16.3% | 11.5–16.3% | 13.1% |
| 90'000 | 17.3% | 12.2–17.3% | 14.1% |
| 100'000 | 18.4% | 13–18.4% | 15.3% |
| 110'000 | 19.3% | 13.8–19.3% | 16.3% |
| 120'000 | 20.1% | 14.4–20.1% | 17.2% |
| 130'000 | 20.9% | 15.1–20.9% | 18.1% |
| 140'000 | 21.8% | 15.7–21.8% | 19% |
| 150'000 | 22.5% | 16.4–22.5% | 19.7% |
| 175'000 | 24.3% | 17.8–24.3% | 21.6% |
| 200'000 | 25.8% | 19.1–25.8% | 23.2% |
| 225'000 | 27% | 20.1–27% | 24.6% |
| 250'000 | 28.2% | 21.1–28.2% | 25.8% |
| 275'000 | 29.1% | 21.9–29.1% | 26.8% |
| 300'000 | 29.8% | 22.5–29.8% | 27.4% |
2026 · Federal Tax Administration (FTA), retrieved 24.09.2026
Climate
MeteoSwiss 1 km grid · 1991–2020Annual mean temperature 1991–20209.3 °C
Precipitation 1991–20201'087 mm
9.3 °CCH range -5.5°14°
1991–2020 · MeteoSwiss, retrieved 28.08.2026
Terrain
swisstopo · DHM 40 mHighest point
503 m
Mean elevation
480 m
Relief
42 m
Mean slope
2.3°
Flat share
94.2%
South-facing
0.0%
Above 2000 m
0.0%
Relief 42 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
5.3 GWh/yr
Roofs + façades
6.9 GWh/yr
≈ households powered
1'200
Per inhabitant
9'085 kWh/yr
5 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
2.7 %
Second homes
7.3 %
Avg. rooms
4.5
Dwellings
259
Built before 194621.2%
Built since 200123.2%
2.7 %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
52
Workplaces
24
Services share
59.6 %
Jobs by sector: Primary 0 (0.0%) · Secondary 0 (0.0%) · Tertiary 31 (59.6%)
STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026
Agriculture
BFS · 2025Farms
3
Organic share
0 %
Farmland
77 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 municipalities579 #93 SO · #1735 CHGrowing municipalities0.4% #56 SO · #1205 CHShrinking municipalities0.4% #49 SO · #902 CHJobs per resident0.09 #103 SO · #2095 CHFamilies & children19.5% #55 SO · #1307 CHAge structure20% #84 SO · #1242 CHWomen share47.5% #95 SO · #1947 CHForeign residents7.8% #93 SO · #1876 CHPopulation density273/km² #55 SO · #832 CHTax burden18'375 #104 SO · #2095 CHTaxes145% #104 SOWarmest municipalities9.3 °C #59 SO · #1147 CHSunniest municipalities40.3% #58 SO · #1683 CHRainiest municipalities1'087 mm #66 SO · #1171 CHVoter turnout59.1% #15 SO · #690 CHSVP strongholds40.1% #11 SO · #656 CHSP strongholds16.8% #34 SO · #762 CHCentre strongholds15% #71 SO · #826 CHFDP strongholds10.8% #97 SO · #1291 CHGLP strongholds8.2% #11 SO · #546 CHGreen strongholds6.2% #61 SO · #1287 CHLargest by area2.1 km² #93 SO · #1995 CHHighest municipalities496 m #42 SO · #1227 CHSecond homes7.3% #88 SO · #1754 CHOrganic farming0% #75 SO · #1759 CHBest-connected municipalities56 min #22 SO · #649 CHRemotest municipalities56 min #83 SO · #1451 CHHighest peaks503 m #82 SO · #1868 CHHighest-lying municipalities480 m #66 SO · #1529 CHGreatest vertical range42 m #97 SO · #2060 CHSteepest municipalities2.3° #90 SO · #1977 CHSolar potential5 GWh #95 SO · #1888 CHSolar potential per capita9'085 kWh #57 SO · #1238 CHCheapest electricity25.19 Rp./kWh #5 SO · #463 CHMost expensive electricity25.19 Rp./kWh #86 SO · #1631 CH
Postal codes (1)
swisstopoLocalities
swisstopo · 1Nearby municipalities
swisstopo- What is the postal code of Bolken?
- The postal code of Bolken is 4556.
- What is the tax rate in Bolken?
- The municipal tax multiplier of Bolken is 145% (2026); canton SO levies 104%.
- How much tax do you pay in Bolken?
- A single person without children pays about 18'375 CHF income tax in Bolken on 100'000 CHF gross income (federal, cantonal, municipal), rank 104 of 104 in canton SO. Source: ESTV (2026).
- How many residents does Bolken have?
- Bolken has 579 residents (2025).
- How many foreign residents live in Bolken?
- Bolken has 45 foreign residents, a share of 7.77% (2025).
Map
OpenStreetMapBolken compared with
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