Therwil: population and statistics
Therwil has a population of 10,141 (2025) across 7.7 km², or 1,324 people per km². It ranks 179 of 2,115 municipalities by population. Its population is growing: +1.3% between 2015 and 2025.
- 10,141 residents
- 7.7 km²
- 1,324 people/km²
- 311 m
Key points
Among the 86 municipalities in Basel-Landschaft, Therwil ranks No. 11 by population.
Dwellings in buildings built before 1946: 4.7% in Therwil, compared with an average of 16.1% in Basel-Landschaft and 22.4% nationally.
Wood heating systems: 2.0% in Therwil, compared with an average of 4.5% in Basel-Landschaft and 9.3% nationally.
A 1 kWp solar panel tilted at 38° generates about 1,146 kWh a year here.
Therwil in numbers
Where is Therwil?
Population of Therwil over time
Therwil had 10,007 residents in 2015 and 10,141 in 2025.
| Year | Population |
|---|---|
| 2020 | 9,979 |
| 2021 | 10,019 |
| 2022 | 9,934 |
| 2023 | 10,068 |
| 2024 | 10,125 |
| 2025 | 10,141 |
Did you know?
- “Dwellings in buildings built before 1946”: lower than in 98% of municipalities.
- “Wood heating systems”: lower than in 94% of municipalities.
- Its area is roughly equal to 1,073 football pitches.
- Its population density is 5.7 times the national average.
- The nearest municipality is Oberwil (BL), 1.6 km away.
- The nearest more populous municipality is Reinach (BL) (21,003 residents), 3.1 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 Therwil
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 | Therwil | Basel-Landschaft | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 65 and over (2025) | 25.1% | 23.5% | 20.7% | ranked 270 of 1,811 |
Housing
| Indicator | Therwil | Basel-Landschaft | National | Position? | Rank |
|---|---|---|---|---|---|
| Dwellings (2026) | 4,906 | 153,148 | 4,927,050 | ranked 202 of 2,108 | |
| Dwellings in buildings built before 1946 (2026) | 4.7% | 16.1% | 23.3% | ranked 1,778 of 1,806 | |
| Dwellings in buildings built since 2001 (2026) | 24.5% | 22.4% | 25.3% | ranked 948 of 1,806 | |
| Share of single-family houses among residential buildings (2026) | 80.2% | 71.2% | 69.5% | ranked 212 of 1,806 |
Energy
| Indicator | Therwil | Basel-Landschaft | National | Position? | Rank |
|---|---|---|---|---|---|
| Oil or gas heating systems (2026) | 76.1% | 65.6% | 53.5% | ranked 181 of 1,806 | |
| Heat pumps as main heating (2026) | 12.4% | 18.1% | 13.7% | ranked 1,015 of 1,806 | |
| Wood heating systems (2026) | 2.0% | 4.5% | 12.4% | ranked 1,700 of 1,806 | |
| District heating (2026) | 8.8% | 9.2% | 1.4% | ranked 274 of 1,806 | |
| Photovoltaic installations (2026) | 395 | 12,078 | 329,600 | ranked 162 of 2,108 | |
| Installed photovoltaic capacity per 1,000 inhabitants (2026) | 679.1 kW | 887.1 kW | 1,134 kW | ranked 1,504 of 1,806 | |
| Rooftop solar electricity potential (2026) | 50.3 GWh/year | 1,865 GWh/year | 64,783 GWh/year | ranked 321 of 2,114 | |
| Rooftop solar potential per inhabitant (2026) | 4,960 kWh/inh. | 6,139 kWh/inh. | 9,356 kWh/inh. | ranked 1,680 of 1,810 |
Economy
| Indicator | Therwil | Basel-Landschaft | National | Position? | Rank |
|---|---|---|---|---|---|
| Establishments (2024) | 559 | 20,022 | 728,011 | ranked 249 of 2,112 | |
| Entities listed in the commercial register (2026) | 548 | 20,160 | 762,757 | ranked 264 of 2,115 | |
| Entities in the commercial register per 1,000 inhabitants (2026) | 54.0 | 66.3 | 64.9 | ranked 1,375 of 1,811 | |
| Share of limited companies (AG, GmbH) among registered entities (2026) | 64.8% | 67.0% | 65.7% | ranked 981 of 1,808 | |
| Share of sole proprietorships among registered entities (2026) | 31.2% | 27.9% | 29.0% | ranked 706 of 1,808 |
Employment
| Indicator | Therwil | Basel-Landschaft | National | Position? | Rank |
|---|---|---|---|---|---|
| Jobs (2024) | 3,401 | 161,523 | 5,679,518 | ranked 292 of 2,111 | |
| Jobs per 1,000 inhabitants (2024) | 335.4 | 531.6 | 362.9 | ranked 1,007 of 1,810 | |
| Share of jobs in services (2024) | 79.1% | 70.6% | 63.6% | ranked 346 of 1,804 | |
| Share of jobs in industry and construction (2024) | 18.1% | 26.1% | 24.2% | ranked 1,202 of 1,776 |
Society
| Indicator | Therwil | Basel-Landschaft | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of foreign nationals (2025) | 20.2% | 25.9% | 18.9% | ranked 806 of 1,811 |
Sunshine and temperatures: Therwil
Frequently asked questions
What is the population of Therwil?
Therwil has 10,141 residents (2025), ranking 179 of 2,115 municipalities.
How big is Therwil?
Therwil covers 7.7 km², with a density of 1,324 people per km².
Is the population of Therwil growing?
Between 2015 and 2025, the population of Therwil went from 10,007 to 10,141, a change of +1.3%.
Where is Therwil?
Therwil is in Basel-Landschaft. It belongs to Bezirk Arlesheim (district). Latitude 47.500, longitude 7.550.
Dwellings in buildings built before 1946: what is the figure for Therwil?
In Therwil, “Dwellings in buildings built before 1946” stands at 4.7% (2026), ranking 1,778 of 1,806 municipalities; the national median is 23.3%.
Wood heating systems: what is the figure for Therwil?
In Therwil, “Wood heating systems” stands at 2.0% (2026), ranking 1,700 of 1,806 municipalities; the national median is 12.4%.
How much electricity does a solar panel produce in Therwil?
In Therwil, a 1 kWp south-facing system tilted at 38° produces about 1,146 kWh a year.
Which municipalities border Therwil?
The nearest to Therwil are Oberwil (BL) (1.6 km), Biel-Benken (2.0 km), Ettingen (2.1 km), Witterswil (2.4 km), Bättwil (2.5 km).