Au (SG): population and statistics
Au (SG) has a population of 8,771 (2025) across 4.7 km², or 1,886 people per km². It ranks 226 of 2,115 municipalities by population. Its population is growing: +18.9% between 2015 and 2025.
- 8,771 residents
- 4.7 km²
- 1,886 people/km²
- 404 m
Key points
Among the 75 municipalities in St. Gallen, Au (SG) ranks No. 19 by population.
District heating: 0.0% in Au (SG), compared with an average of 6.0% in St. Gallen and 7.3% nationally.
Share of foreign nationals: 39.0% in Au (SG), compared with an average of 27.2% in St. Gallen and 27.7% nationally.
A 1 kWp solar panel tilted at 39° generates about 1,187 kWh a year here.
Au (SG) in numbers
Where is Au (SG)?
Population of Au (SG) over time
Au (SG) had 7,378 residents in 2015 and 8,771 in 2025.
| Year | Population |
|---|---|
| 2020 | 7,984 |
| 2021 | 8,044 |
| 2022 | 8,252 |
| 2023 | 8,481 |
| 2024 | 8,628 |
| 2025 | 8,771 |
Did you know?
- “District heating”: lower than in 99% of municipalities.
- “Share of foreign nationals”: higher than in 95% of municipalities.
- “Entities listed in the commercial register”: higher than in 92% of municipalities.
- Its area is roughly equal to 651 football pitches.
- Its population density is 8.1 times the national average.
- The nearest municipality is Berneck, 1.8 km away.
- The nearest more populous municipality is Arbon (16,407 residents), 18 km away.
All indicators for Au (SG)
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 | Au (SG) | St. Gallen | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of people aged 65 and over (2025) | 18.2% | 19.9% | 20.7% | ranked 1,361 of 1,811 |
Housing
| Indicator | Au (SG) | St. Gallen | National | Position? | Rank |
|---|---|---|---|---|---|
| Dwellings (2026) | 4,250 | 280,853 | 4,927,050 | ranked 251 of 2,108 | |
| Dwellings in buildings built before 1946 (2026) | 9.6% | 23.5% | 23.3% | ranked 1,626 of 1,806 | |
| Dwellings in buildings built since 2001 (2026) | 34.2% | 24.8% | 25.3% | ranked 371 of 1,806 | |
| Share of single-family houses among residential buildings (2026) | 71.5% | 64.1% | 69.5% | ranked 785 of 1,806 |
Energy
| Indicator | Au (SG) | St. Gallen | National | Position? | Rank |
|---|---|---|---|---|---|
| Oil or gas heating systems (2026) | 61.6% | 52.2% | 53.5% | ranked 635 of 1,806 | |
| Heat pumps as main heating (2026) | 35.5% | 30.7% | 13.7% | ranked 142 of 1,806 | |
| Wood heating systems (2026) | 1.7% | 9.0% | 12.4% | ranked 1,722 of 1,806 | |
| District heating (2026) | 0.0% | 6.0% | 1.4% | ranked 1,506 of 1,806 | |
| Photovoltaic installations (2026) | 387 | 26,111 | 329,600 | ranked 169 of 2,108 | |
| Installed photovoltaic capacity per 1,000 inhabitants (2026) | 1,667 kW | 1,325 kW | 1,134 kW | ranked 389 of 1,806 | |
| Rooftop solar electricity potential (2026) | 59.6 GWh/year | 4,072 GWh/year | 64,783 GWh/year | ranked 246 of 2,114 | |
| Rooftop solar potential per inhabitant (2026) | 6,796 kWh/inh. | 7,485 kWh/inh. | 9,356 kWh/inh. | ranked 1,422 of 1,810 |
Economy
| Indicator | Au (SG) | St. Gallen | National | Position? | Rank |
|---|---|---|---|---|---|
| Establishments (2024) | 631 | 39,699 | 728,011 | ranked 216 of 2,112 | |
| Entities listed in the commercial register (2026) | 805 | 42,658 | 762,757 | ranked 169 of 2,115 | |
| Entities in the commercial register per 1,000 inhabitants (2026) | 91.8 | 78.4 | 64.9 | ranked 276 of 1,811 | |
| Share of limited companies (AG, GmbH) among registered entities (2026) | 65.8% | 65.2% | 65.7% | ranked 894 of 1,808 | |
| Share of sole proprietorships among registered entities (2026) | 29.3% | 29.2% | 29.0% | ranked 872 of 1,808 |
Employment
| Indicator | Au (SG) | St. Gallen | National | Position? | Rank |
|---|---|---|---|---|---|
| Jobs (2024) | 4,751 | 317,461 | 5,679,518 | ranked 202 of 2,111 | |
| Jobs per 1,000 inhabitants (2024) | 541.7 | 583.5 | 362.9 | ranked 413 of 1,810 | |
| Share of jobs in services (2024) | 63.1% | 64.9% | 63.6% | ranked 918 of 1,804 | |
| Share of jobs in industry and construction (2024) | 36.3% | 30.3% | 24.2% | ranked 391 of 1,776 |
Society
| Indicator | Au (SG) | St. Gallen | National | Position? | Rank |
|---|---|---|---|---|---|
| Share of foreign nationals (2025) | 39.0% | 27.2% | 18.9% | ranked 87 of 1,811 |
Sunshine and temperatures: Au (SG)
Frequently asked questions
What is the population of Au (SG)?
Au (SG) has 8,771 residents (2025), ranking 226 of 2,115 municipalities.
How big is Au (SG)?
Au (SG) covers 4.7 km², with a density of 1,886 people per km².
Is the population of Au (SG) growing?
Between 2015 and 2025, the population of Au (SG) went from 7,378 to 8,771, a change of +18.9%.
Where is Au (SG)?
Au (SG) is in St. Gallen. It belongs to Wahlkreis Rheintal (district). Latitude 47.433, longitude 9.633.
District heating: what is the figure for Au (SG)?
In Au (SG), “District heating” stands at 0.0% (2026), ranking 1,506 of 1,806 municipalities; the national median is 1.4%.
Share of foreign nationals: what is the figure for Au (SG)?
In Au (SG), “Share of foreign nationals” stands at 39.0% (2025), ranking 87 of 1,811 municipalities; the national median is 18.9%.
How much electricity does a solar panel produce in Au (SG)?
In Au (SG), a 1 kWp south-facing system tilted at 39° produces about 1,187 kWh a year.
Which municipalities border Au (SG)?
The nearest to Au (SG) are Berneck (1.8 km), St. Margrethen (1.9 km), Walzenhausen (3.1 km), Widnau (3.7 km), Balgach (4.5 km).