Demographics
BFS · 2025Women
2'038 49.6%
Men
2'075 50.4%
Children & youth (0–19)
785 19.1%
Swiss citizens
3'602 87.6%
Foreign residents
511 12.4%
Population density
310 pop./km²
0–19 · 785 · 19.1%20–64 · 2'361 · 57.4%65+ · 967 · 23.5%
Foreign residents 12.4%0%64.0%
Population change 2025: −16 (−0.4%) · 29 births · 31 deaths · net migration −20
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 Gösgen: 26.4% Yes
26.6% YesNo 73.4%
27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% YesDistrict Bezirk Gösgen: 29.0% Yes
27.8% YesNo 72.3%
14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% YesDistrict Bezirk Gösgen: 56.5% Yes
56.8% YesNo 43.2%
14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% YesDistrict Bezirk Gösgen: 53.3% Yes
52.3% YesNo 47.7%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung des KantonsratsgesetzesCantonal SO● Accepted · 58.6% YesDistrict Bezirk Gösgen: 58.9% Yes
59.2% YesNo 40.8%
14.06.2026Stellvertretung im Kantonsrat bei Mutterschaft: Änderung der KantonsverfassungCantonal SO● Accepted · 58.7% YesDistrict Bezirk Gösgen: 59.1% Yes
59.4% YesNo 40.6%
08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% YesDistrict Bezirk Gösgen: 50.6% Yes
51.9% YesNo 48.1%
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 Gösgen: 23.5% Yes
20.8% YesNo 79.2%
08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% YesDistrict Bezirk Gösgen: 41.8% Yes
41.3% YesNo 58.7%
08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% YesDistrict Bezirk Gösgen: 39.0% Yes
35.8% YesNo 64.2%
Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 04.10.2026
Politics
National Council election 2023SVP29.1% · strongest party
SVP29.1%
Mitte19.8%
FDP18.8%
SP15.8%
GRÜNE6.4%
sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 25.09.2026
Taxes 2026
ESTVMunicipal tax multiplier113%
Cantonal tax multiplier104%
113%SO range 65%145%
Tax rank 28 of 104 in canton SolothurnTax burden
Single, 100'000 CHF gross income
16'210 CHF(16.2%)
Rank 27 of 104 in the canton · 1392 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:16'210 CHF(~16.2%)
LostorfCanton range SolothurnSwitzerland median
Show data table
| Gross income | Lostorf | Solothurn | Switzerland median |
|---|---|---|---|
| 40'000 | 7.6% | 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 | 14.4% | 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 | 17.1% | 13.8–19.3% | 16.3% |
| 120'000 | 17.8% | 14.4–20.1% | 17.2% |
| 130'000 | 18.6% | 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 | 21.7% | 17.8–24.3% | 21.6% |
| 200'000 | 23.1% | 19.1–25.8% | 23.2% |
| 225'000 | 24.3% | 20.1–27% | 24.6% |
| 250'000 | 25.3% | 21.1–28.2% | 25.8% |
| 275'000 | 26.2% | 21.9–29.1% | 26.8% |
| 300'000 | 26.9% | 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 °C
Precipitation 1991–20201'086 mm
9 °CCH range -5.5°14°
1991–2020 · MeteoSwiss, retrieved 28.08.2026
Terrain
swisstopo · DHM 40 mHighest point
936 m
Mean elevation
596 m
Relief
530 m
Mean slope
13.8°
Flat share
23.6%
South-facing
42.1%
Above 2000 m
0.0%
Relief 530 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
33.4 GWh/yr
Roofs + façades
43.5 GWh/yr
≈ households powered
7'400
Per inhabitant
8'111 kWh/yr
33 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
31.21 Rp./kWh
Energy
13.45 Rp./kWh
Grid usage
13.78 Rp./kWh
Levies + grid surcharge
2.91 Rp./kWh
31.21 Rp./kWh10.5645.88
Canton median 28.51 Rp./kWhSwiss median 26.53 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.
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
3.38 %
Second homes
8.2 %
Avg. rooms
4.2
Dwellings
1'982
Built before 194614.1%
Built since 200122.9%
3.38 %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
1'079
Workplaces
214
Services share
66.1 %
Jobs by sector: Primary 65 (6.0%) · Secondary 301 (27.9%) · Tertiary 713 (66.1%)
STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026
Agriculture
BFS · 2025Farms
24
Organic share
8.3 %
Farmland
282 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 municipalities4'113 #21 SO · #541 CHGrowing municipalities-0.4% #76 SO · #1606 CHShrinking municipalities-0.4% #29 SO · #504 CHJobs per resident0.26 #67 SO · #1475 CHFamilies & children19.1% #64 SO · #1420 CHAge structure23.5% #36 SO · #584 CHWomen share49.6% #60 SO · #1201 CHForeign residents12.4% #69 SO · #1503 CHPopulation density310/km² #52 SO · #762 CHTax burden16'210 #29 SO · #1394 CHTaxes113% #28 SOWarmest municipalities9 °C #82 SO · #1368 CHSunniest municipalities40.4% #50 SO · #1643 CHRainiest municipalities1'086 mm #68 SO · #1176 CHVoter turnout59.3% #14 SO · #667 CHAgainst Switzerland13.7% #30 SO · #1001 CHAligned with Switzerland86.3% #40 SO · #457 CHSVP strongholds29.1% #73 SO · #1326 CHSP strongholds15.8% #41 SO · #861 CHCentre strongholds19.8% #44 SO · #536 CHFDP strongholds18.8% #34 SO · #537 CHGLP strongholds6% #44 SO · #972 CHGreen strongholds6.4% #57 SO · #1226 CHLargest by area13.3 km² #13 SO · #736 CHHighest municipalities523 m #31 SO · #1107 CHSecond homes8.2% #73 SO · #1581 CHOrganic farming8.3% #61 SO · #1346 CHBest-connected municipalities70 min #74 SO · #1077 CHRemotest municipalities70 min #28 SO · #1026 CHHighest peaks936 m #31 SO · #781 CHHighest-lying municipalities596 m #34 SO · #1021 CHGreatest vertical range530 m #25 SO · #670 CHSteepest municipalities13.8° #31 SO · #635 CHSolar potential33 GWh #25 SO · #604 CHSolar potential per capita8'111 kWh #71 SO · #1443 CHCheapest electricity31.21 Rp./kWh #72 SO · #1915 CHMost expensive electricity31.21 Rp./kWh #28 SO · #167 CH
Postal codes (2)
swisstopoLocalities
swisstopo · 2Nearby municipalities
swisstopo- What is the postal code of Lostorf?
- Lostorf has 2 postal codes: 4634, 4654.
- What is the tax rate in Lostorf?
- The municipal tax multiplier of Lostorf is 113% (2026); canton SO levies 104%.
- How much tax do you pay in Lostorf?
- A single person without children pays about 16'210 CHF income tax in Lostorf on 100'000 CHF gross income (federal, cantonal, municipal), rank 27 of 104 in canton SO. Source: ESTV (2026).
- How many residents does Lostorf have?
- Lostorf has 4'113 residents (2025).
- How many foreign residents live in Lostorf?
- Lostorf has 511 foreign residents, a share of 12.42% (2025).
Map
OpenStreetMapLostorf compared with
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