Unterentfelden: population and statistics
Unterentfelden has a population of 4,579 (2025) across 2.9 km², or 1,590 people per km². It ranks 485 of 2,115 municipalities by population. Its population is growing: +11.1% between 2015 and 2025.
- 4,579 residents
- 2.9 km²
- 1,590 people/km²
- 420 m
Key points
Among the 197 municipalities in Aargau, Unterentfelden ranks No. 51 by population.
Oil or gas heating systems: 77.8% in Unterentfelden, compared with an average of 66.6% in Aargau and 61.7% nationally.
Dwellings in buildings built before 1946: 9.3% in Unterentfelden, compared with an average of 16.6% in Aargau and 22.4% nationally.
A 1 kWp solar panel tilted at 37° generates about 1,156 kWh a year here.
Unterentfelden in numbers
Where is Unterentfelden?
Population of Unterentfelden over time
Unterentfelden had 4,120 residents in 2015 and 4,579 in 2025.
| Year | Population |
|---|---|
| 2020 | 4,382 |
| 2021 | 4,392 |
| 2022 | 4,391 |
| 2023 | 4,579 |
| 2024 | 4,550 |
| 2025 | 4,579 |
Did you know?
- “Oil or gas heating systems”: higher than in 92% of municipalities.
- “Dwellings in buildings built before 1946”: lower than in 91% of municipalities.
- Its area is roughly equal to 403 football pitches.
- Its population density is 6.8 times the national average.
- The nearest more populous municipality is Oberentfelden (9,061 residents), 1.2 km away.
- A 4 kWp rooftop solar system here would generate about 4,624 kWh a year, roughly what an average household uses.
All indicators for Unterentfelden
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 | Unterentfelden | Aargau | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 65 and over (2025) | 19.5% | 19.5% | 20.7% | ranked 1,127 of 1,811 |
Housing
| Indicator | Unterentfelden | Aargau | National | Position? | Rank |
|---|---|---|---|---|---|
| Dwellings (2026) | 2,139 | 355,613 | 4,927,050 | ranked 567 of 2,108 | |
| Dwellings in buildings built before 1946 (2026) | 9.3% | 16.6% | 23.3% | ranked 1,648 of 1,806 | |
| Dwellings in buildings built since 2001 (2026) | 30.1% | 30.9% | 25.3% | ranked 594 of 1,806 | |
| Share of single-family houses among residential buildings (2026) | 77.2% | 70.4% | 69.5% | ranked 406 of 1,806 |
Energy
| Indicator | Unterentfelden | Aargau | National | Position? | Rank |
|---|---|---|---|---|---|
| Oil or gas heating systems (2026) | 77.8% | 66.6% | 53.5% | ranked 143 of 1,806 | |
| Heat pumps as main heating (2026) | 6.5% | 11.6% | 13.7% | ranked 1,536 of 1,806 | |
| Wood heating systems (2026) | 3.8% | 8.3% | 12.4% | ranked 1,550 of 1,806 | |
| District heating (2026) | 0.3% | 6.5% | 1.4% | ranked 1,399 of 1,806 | |
| Photovoltaic installations (2026) | 136 | 26,039 | 329,600 | ranked 820 of 2,108 | |
| Installed photovoltaic capacity per 1,000 inhabitants (2026) | 751.9 kW | 997.1 kW | 1,134 kW | ranked 1,417 of 1,806 | |
| Rooftop solar electricity potential (2026) | 34.1 GWh/year | 5,431 GWh/year | 64,783 GWh/year | ranked 588 of 2,114 | |
| Rooftop solar potential per inhabitant (2026) | 7,445 kWh/inh. | 7,302 kWh/inh. | 9,356 kWh/inh. | ranked 1,289 of 1,810 |
Economy
| Indicator | Unterentfelden | Aargau | National | Position? | Rank |
|---|---|---|---|---|---|
| Establishments (2024) | 245 | 47,193 | 728,011 | ranked 626 of 2,112 | |
| Entities listed in the commercial register (2026) | 223 | 46,143 | 762,757 | ranked 672 of 2,115 | |
| Entities in the commercial register per 1,000 inhabitants (2026) | 48.7 | 62.0 | 64.9 | ranked 1,560 of 1,811 | |
| Share of limited companies (AG, GmbH) among registered entities (2026) | 67.3% | 66.6% | 65.7% | ranked 748 of 1,808 | |
| Share of sole proprietorships among registered entities (2026) | 28.3% | 29.1% | 29.0% | ranked 970 of 1,808 |
Employment
| Indicator | Unterentfelden | Aargau | National | Position? | Rank |
|---|---|---|---|---|---|
| Jobs (2024) | 2,938 | 364,295 | 5,679,518 | ranked 336 of 2,111 | |
| Jobs per 1,000 inhabitants (2024) | 641.6 | 489.8 | 362.9 | ranked 258 of 1,810 | |
| Share of jobs in services (2024) | 74.5% | 69.1% | 63.6% | ranked 496 of 1,804 | |
| Share of jobs in industry and construction (2024) | 24.8% | 26.5% | 24.2% | ranked 860 of 1,776 |
Society
| Indicator | Unterentfelden | Aargau | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of foreign nationals (2025) | 31.0% | 28.1% | 18.9% | ranked 260 of 1,811 |
Sunshine and temperatures: Unterentfelden
Frequently asked questions
What is the population of Unterentfelden?
Unterentfelden has 4,579 residents (2025), ranking 485 of 2,115 municipalities.
How big is Unterentfelden?
Unterentfelden covers 2.9 km², with a density of 1,590 people per km².
Is the population of Unterentfelden growing?
Between 2015 and 2025, the population of Unterentfelden went from 4,120 to 4,579, a change of +11.1%.
Where is Unterentfelden?
Unterentfelden is in Aargau. It belongs to Bezirk Aarau (district). Latitude 47.369, longitude 8.042.
Oil or gas heating systems: what is the figure for Unterentfelden?
In Unterentfelden, “Oil or gas heating systems” stands at 77.8% (2026), ranking 143 of 1,806 municipalities; the national median is 53.5%.
Dwellings in buildings built before 1946: what is the figure for Unterentfelden?
In Unterentfelden, “Dwellings in buildings built before 1946” stands at 9.3% (2026), ranking 1,648 of 1,806 municipalities; the national median is 23.3%.
How much electricity does a solar panel produce in Unterentfelden?
In Unterentfelden, a 1 kWp south-facing system tilted at 37° produces about 1,156 kWh a year.
Which municipalities border Unterentfelden?
The nearest to Unterentfelden are Oberentfelden (1.2 km), Eppenberg-Wöschnau (1.5 km), Aarau (2.6 km), Schönenwerd (2.9 km), Suhr (3.0 km).