Demographics
BFS · 2025Women
4'335 49.4%
Men
4'436 50.6%
Children & youth (0–19)
1'756 20.0%
Swiss citizens
5'355 61.1%
Foreign residents
3'416 39.0%
Population density
1'886 pop./km²
0–19 · 1'756 · 20.0%20–64 · 5'418 · 61.8%65+ · 1'597 · 18.2%
Foreign residents 39.0%0%64.0%
Population change 2025: +143 (+1.7%) · 102 births · 68 deaths · net migration +122
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 Wahlkreis Rheintal: 21.5% Yes
20.9% YesNo 79.1%
27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% YesDistrict Wahlkreis Rheintal: 40.2% Yes
38.4% YesNo 61.6%
14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% YesDistrict Wahlkreis Rheintal: 62.4% Yes
61.6% YesNo 38.5%
14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% YesDistrict Wahlkreis Rheintal: 61.5% Yes
57.5% YesNo 42.5%
14.06.2026Gesetz über Beiträge für familien- und schulergänzende KinderbetreuungCantonal SG● Accepted · 57.8% YesDistrict Wahlkreis Rheintal: 55.6% Yes
59.6% YesNo 40.4%
08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% YesDistrict Wahlkreis Rheintal: 38.4% Yes
41.3% YesNo 58.7%
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 Wahlkreis Rheintal: 17.3% Yes
17.2% YesNo 82.8%
08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% YesDistrict Wahlkreis Rheintal: 47.9% Yes
48.5% YesNo 51.5%
08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% YesDistrict Wahlkreis Rheintal: 44.5% Yes
45.3% YesNo 54.7%
08.03.2026Federal decree on Swiss currency and cash supply (counter-proposal to Cash Initiative)Federal● Accepted · 73.4% YesDistrict Wahlkreis Rheintal: 71.6% Yes
70.1% YesNo 30.0%
Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 04.10.2026
Politics
National Council election 2023SVP38.8% · strongest party
SVP38.8%
Mitte18.1%
FDP14.4%
SP9.9%
GRÜNE6.2%
sd-t-17.02-NRW2023 2023 · Federal Statistical Office (FSO), retrieved 25.09.2026
Taxes 2026
ESTVMunicipal tax multiplier99%
Cantonal tax multiplier105%
99%SG range 61%155%
Tax rank 14 of 75 in canton St. GallenTax burden
Single, 100'000 CHF gross income
12'983 CHF(13%)
Rank 13 of 75 in the canton · 513 of 2110 in Switzerland
Median canton 13'868 CHF · median Switzerland 15'290 CHF
Cheapest Balgach 10'881 CHF · most expensive Lütisburg 16'080 CHF
100'000 CHF:12'983 CHF(~13%)
AuCanton range St. GallenSwitzerland median
Show data table
| Gross income | Au | St. Gallen | Switzerland median |
|---|---|---|---|
| 40'000 | 5.8% | 4.8–7.3% | 5.4% |
| 50'000 | 7.4% | 6.1–9.3% | 7.8% |
| 60'000 | 8.9% | 7.4–11.2% | 10.5% |
| 70'000 | 10% | 8.3–12.5% | 11.9% |
| 80'000 | 11.1% | 9.2–13.8% | 13.1% |
| 90'000 | 12% | 10–14.9% | 14.1% |
| 100'000 | 13% | 10.9–16.1% | 15.3% |
| 110'000 | 13.9% | 11.7–17.1% | 16.3% |
| 120'000 | 14.6% | 12.3–18% | 17.2% |
| 130'000 | 15.3% | 12.9–18.7% | 18.1% |
| 140'000 | 16% | 13.6–19.5% | 19% |
| 150'000 | 16.6% | 14.1–20.2% | 19.7% |
| 175'000 | 18% | 15.4–21.8% | 21.6% |
| 200'000 | 19.2% | 16.5–23.1% | 23.2% |
| 225'000 | 20.2% | 17.5–24.2% | 24.6% |
| 250'000 | 21.1% | 18.4–25.2% | 25.8% |
| 275'000 | 21.9% | 19.1–26.1% | 26.8% |
| 300'000 | 22.5% | 19.7–26.7% | 27.4% |
2026 · Federal Tax Administration (FTA), retrieved 24.09.2026
Climate
MeteoSwiss 1 km grid · 1991–2020Annual mean temperature 1991–202010.4 °C
Precipitation 1991–20201'128 mm
10.4 °CCH range -5.5°14°
1991–2020 · MeteoSwiss, retrieved 28.08.2026
Terrain
swisstopo · DHM 40 mHighest point
659 m
Mean elevation
414 m
Relief
260 m
Mean slope
3.9°
Flat share
83.6%
South-facing
10.6%
Above 2000 m
0.0%
Relief 260 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
59.6 GWh/yr
Roofs + façades
78.5 GWh/yr
≈ households powered
13'200
Per inhabitant
6'796 kWh/yr
60 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
30.23 Rp./kWh
Energy
13.32 Rp./kWh
Grid usage
12.29 Rp./kWh
Levies + grid surcharge
3.3 Rp./kWh
30.23 Rp./kWh10.5645.88
Canton median 30.11 Rp./kWhSwiss median 26.53 Rp./kWh
Network operator Politische Gemeinde Au SG, Elektrizitätswerk
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 · 2024Premium regionRegion 2
Standard model, deductible 300538 CHF/mo
Ø premium in canton St. Gallen377 CHF/mo
Estimate Switzerland 2026465.3 CHF/mo
Premiums are set per canton and premium region. This area lies in premium region 2 of canton St. Gallen. Shown is the average adult premium paid across the whole canton St. Gallen (2024, BAG) — a region-specific average is not available in the cantonal data.
2024 · Federal Office of Public Health (FOPH), retrieved 12.09.2026
Housing
BFS · AREVacancy rate
2.98 %
Second homes
7.7 %
Avg. rooms
3.8
Dwellings
4'200
Built before 19469.6%
Built since 200133.1%
2.98 %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
4'751
Workplaces
631
Services share
63.1 %
Jobs by sector: Primary 29 (0.6%) · Secondary 1'726 (36.3%) · Tertiary 2'996 (63.1%)
STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026
Agriculture
BFS · 2025Farms
9
Organic share
0 %
Farmland
285 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 municipalities8'771 #19 SG · #226 CHGrowing municipalities1.7% #6 SG · #464 CHShrinking municipalities1.7% #69 SG · #1644 CHJobs per resident0.54 #21 SG · #446 CHFamilies & children20% #52 SG · #1147 CHAge structure18.2% #54 SG · #1609 CHWomen share49.4% #35 SG · #1327 CHForeign residents39% #5 SG · #90 CHPopulation density1'886/km² #5 SG · #86 CHTax burden12'983 #14 SG · #514 CHTaxes99% #14 SGWarmest municipalities10.4 °C #5 SG · #243 CHSunniest municipalities41.3% #43 SG · #1287 CHRainiest municipalities1'128 mm #56 SG · #933 CHVoter turnout48.6% #72 SG · #1887 CHAgainst Switzerland17.6% #41 SG · #697 CHAligned with Switzerland82.4% #34 SG · #746 CHSVP strongholds38.8% #37 SG · #728 CHSP strongholds9.9% #33 SG · #1531 CHCentre strongholds18.1% #53 SG · #637 CHFDP strongholds14.4% #35 SG · #884 CHGLP strongholds5.8% #19 SG · #1014 CHGreen strongholds6.2% #46 SG · #1289 CHLargest by area4.7 km² #66 SG · #1594 CHHighest municipalities405 m #72 SG · #1867 CHSecond homes7.7% #69 SG · #1689 CHOrganic farming0% #68 SG · #1821 CHBest-connected municipalities124 min #62 SG · #1953 CHRemotest municipalities124 min #14 SG · #152 CHHighest peaks659 m #57 SG · #1332 CHHighest-lying municipalities414 m #72 SG · #1936 CHGreatest vertical range260 m #51 SG · #1116 CHSteepest municipalities3.9° #70 SG · #1758 CHSolar potential60 GWh #20 SG · #246 CHSolar potential per capita6'796 kWh #57 SG · #1716 CHCheapest electricity30.23 Rp./kWh #40 SG · #1813 CHMost expensive electricity30.23 Rp./kWh #35 SG · #294 CH
Postal codes (2)
swisstopoLocalities
swisstopo · 2Nearby municipalities
swisstopo- What is the postal code of Au?
- Au has 2 postal codes: 9434, 9435.
- What is the tax rate in Au?
- The municipal tax multiplier of Au is 99% (2026); canton SG levies 105%.
- How much tax do you pay in Au?
- A single person without children pays about 12'983 CHF income tax in Au on 100'000 CHF gross income (federal, cantonal, municipal), rank 13 of 75 in canton SG. Source: ESTV (2026).
- How many residents does Au have?
- Au has 8'771 residents (2025).
- How many foreign residents live in Au?
- Au has 3'416 foreign residents, a share of 38.95% (2025).
Map
OpenStreetMapAu compared with
- Au vs. St. Gallen
- Au vs. Rapperswil-Jona
- Au vs. Wil
- Au vs. Gossau
- Au vs. Uzwil
- Au vs. Buchs
- Au vs. Altstätten
- Au vs. Flawil
- Au vs. Widnau
- Au vs. Eschenbach
- Au vs. St. Gallen
- Au vs. Rapperswil-Jona
- Au vs. Wil
- Au vs. Gossau
- Au vs. Uzwil
- Au vs. Buchs
- Au vs. Altstätten
- Au vs. Flawil
- Au vs. Widnau
- Au vs. Eschenbach
- Au vs. Baden
- Au vs. Schwende-Rüte
- Au vs. Herisau
- Au vs. Bern
- Au vs. Allschwil
- Au vs. Basel
- Au vs. Fribourg
- Au vs. Geneva
- Au vs. Glarus Nord
- Au vs. Chur
- Au vs. Delémont
- Au vs. Lucerne
- Au vs. Neuchâtel
- Au vs. Stans
- Au vs. Sarnen
- Au vs. Schaffhausen
- Au vs. Olten
- Au vs. Freienbach
- Au vs. Frauenfeld
- Au vs. Lugano
- Au vs. Altdorf
- Au vs. Lausanne
- Au vs. Sion
- Au vs. Zug
- Au vs. Zurich