Lostorf: population and statistics
Lostorf has a population of 4,113 (2025) across 13.3 km², or 310 people per km². It ranks 542 of 2,115 municipalities by population. Its population is growing: +4.8% between 2015 and 2025.
- 4,113 residents
- 13.3 km²
- 310 people/km²
- 438 m
Key points
Among the 106 municipalities in Solothurn, Lostorf ranks No. 21 by population.
Share of single-family houses among residential buildings: 82.2% in Lostorf, compared with an average of 70.1% in Solothurn and 56.9% nationally.
Share of sole proprietorships among registered entities: 39.3% in Lostorf, compared with an average of 29.3% in Solothurn and 26.1% nationally.
A 1 kWp solar panel tilted at 37° generates about 1,146 kWh a year here.
Lostorf in numbers
Where is Lostorf?
Population of Lostorf over time
Lostorf had 3,926 residents in 2015 and 4,113 in 2025.
| Year | Population |
|---|---|
| 2020 | 3,963 |
| 2021 | 4,049 |
| 2022 | 4,067 |
| 2023 | 4,088 |
| 2024 | 4,129 |
| 2025 | 4,113 |
Did you know?
- “Share of single-family houses among residential buildings”: higher than in 93% of municipalities.
- Its area is roughly equal to 1,859 football pitches.
- The nearest municipality is Stüsslingen, 1.9 km away.
- The nearest more populous municipality is Trimbach (6,928 residents), 4.4 km away.
- A 4 kWp rooftop solar system here would generate about 4,584 kWh a year, roughly what an average household uses.
All indicators for Lostorf
Value for the municipality, then the regional average and the national median (for counts: regional and national totals). The gauge places the municipality between the lowest and highest value in the country.
Population
| Indicator | Lostorf | Solothurn | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 65 and over (2025) | 23.5% | 21.7% | 20.7% | ranked 450 of 1,811 |
Housing
| Indicator | Lostorf | Solothurn | National | Position? | Rank |
|---|---|---|---|---|---|
| Dwellings (2026) | 2,017 | 148,900 | 4,927,050 | ranked 598 of 2,108 | |
| Dwellings in buildings built before 1946 (2026) | 14.2% | 22.0% | 23.3% | ranked 1,394 of 1,806 | |
| Dwellings in buildings built since 2001 (2026) | 23.3% | 21.9% | 25.3% | ranked 1,027 of 1,806 | |
| Share of single-family houses among residential buildings (2026) | 82.2% | 70.1% | 69.5% | ranked 130 of 1,806 |
Energy
| Indicator | Lostorf | Solothurn | National | Position? | Rank |
|---|---|---|---|---|---|
| Oil or gas heating systems (2026) | 71.9% | 72.7% | 53.5% | ranked 298 of 1,806 | |
| Heat pumps as main heating (2026) | 8.6% | 11.4% | 13.7% | ranked 1,356 of 1,806 | |
| Wood heating systems (2026) | 8.2% | 8.1% | 12.4% | ranked 1,184 of 1,806 | |
| District heating (2026) | 0.4% | 2.7% | 1.4% | ranked 1,321 of 1,806 | |
| Photovoltaic installations (2026) | 195 | 11,211 | 329,600 | ranked 532 of 2,108 | |
| Installed photovoltaic capacity per 1,000 inhabitants (2026) | 1,018 kW | 1,095 kW | 1,134 kW | ranked 1,071 of 1,806 | |
| Rooftop solar electricity potential (2026) | 33.4 GWh/year | 2,373 GWh/year | 64,783 GWh/year | ranked 605 of 2,114 | |
| Rooftop solar potential per inhabitant (2026) | 8,111 kWh/inh. | 8,138 kWh/inh. | 9,356 kWh/inh. | ranked 1,154 of 1,810 |
Economy
| Indicator | Lostorf | Solothurn | National | Position? | Rank |
|---|---|---|---|---|---|
| Establishments (2024) | 214 | 18,596 | 728,011 | ranked 722 of 2,112 | |
| Entities listed in the commercial register (2026) | 214 | 18,362 | 762,757 | ranked 694 of 2,115 | |
| Entities in the commercial register per 1,000 inhabitants (2026) | 52.0 | 63.0 | 64.9 | ranked 1,455 of 1,811 | |
| Share of limited companies (AG, GmbH) among registered entities (2026) | 57.5% | 65.9% | 65.7% | ranked 1,519 of 1,808 | |
| Share of sole proprietorships among registered entities (2026) | 39.3% | 29.3% | 29.0% | ranked 193 of 1,808 |
Employment
| Indicator | Lostorf | Solothurn | National | Position? | Rank |
|---|---|---|---|---|---|
| Jobs (2024) | 1,079 | 151,633 | 5,679,518 | ranked 779 of 2,111 | |
| Jobs per 1,000 inhabitants (2024) | 262.3 | 520.0 | 362.9 | ranked 1,320 of 1,810 | |
| Share of jobs in services (2024) | 66.1% | 67.4% | 63.6% | ranked 806 of 1,804 | |
| Share of jobs in industry and construction (2024) | 27.9% | 27.9% | 24.2% | ranked 724 of 1,776 |
Society
| Indicator | Lostorf | Solothurn | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of foreign nationals (2025) | 12.4% | 25.9% | 18.9% | ranked 1,374 of 1,811 |
Sunshine and temperatures: Lostorf
Frequently asked questions
What is the population of Lostorf?
Lostorf has 4,113 residents (2025), ranking 542 of 2,115 municipalities.
How big is Lostorf?
Lostorf covers 13.3 km², with a density of 310 people per km².
Is the population of Lostorf growing?
Between 2015 and 2025, the population of Lostorf went from 3,926 to 4,113, a change of +4.8%.
Where is Lostorf?
Lostorf is in Solothurn. It belongs to Bezirk Gösgen (district). Latitude 47.384, longitude 7.950.
Share of single-family houses among residential buildings: what is the figure for Lostorf?
In Lostorf, “Share of single-family houses among residential buildings” stands at 82.2% (2026), ranking 130 of 1,806 municipalities; the national median is 69.5%.
Share of sole proprietorships among registered entities: what is the figure for Lostorf?
In Lostorf, “Share of sole proprietorships among registered entities” stands at 39.3% (2026), ranking 193 of 1,808 municipalities; the national median is 29.0%.
How much electricity does a solar panel produce in Lostorf?
In Lostorf, a 1 kWp south-facing system tilted at 37° produces about 1,146 kWh a year.
Which municipalities border Lostorf?
The nearest to Lostorf are Stüsslingen (1.9 km), Obergösgen (2.0 km), Winznau (2.4 km), Niedergösgen (3.5 km), Dulliken (3.6 km).