Switzerland · Canton SG
Au
9434–9435Residents
8'771
Area
4.7 km²
Population density
1'886 pop./km²
Elevation
405 m a.s.l.
Terrain up to
659 m a.s.l.
Tax multiplier
99%
Postal codes
2
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%
STATPOP 2025 · Federal Statistical Office (FSO), retrieved 31.08.2026 · swisstopo, retrieved 24.08.2026
14.06.2026Änderung des Bundesgesetzes über den zivilen Ersatzdienst (Zivildienstgesetz, ZDG)Federal● Accepted · 52.5% Yes
61.6% YesNo 38.5%
14.06.2026Volksinitiative «Keine 10-Millionen-Schweiz! (Nachhaltigkeitsinitiative)»Federal● Rejected · 45.2% Yes
57.5% YesNo 42.5%
14.06.2026Gesetz über Beiträge für familien- und schulergänzende KinderbetreuungCantonal SG● Accepted · 57.8% Yes
59.6% YesNo 40.4%
08.03.2026Volksinitiative «Für eine gerechte Energie- und Klimapolitik: Investieren für Wohlstand, Arbeit und Umwelt (Klimafonds-Initiative)»Federal● Rejected · 29.3% Yes
17.2% YesNo 82.8%
08.03.2026Volksinitiative «200 Franken sind genug! (SRG-Initiative)»Federal● Rejected · 38.1% Yes
48.5% YesNo 51.5%
08.03.2026Bargeldinitiative und Gegenvorschlag: StichfrageFederal● Rejected · 37.4% Yes
45.3% YesNo 54.7%
08.03.2026Bundesbeschluss über die schweizerische Währung und die Bargeldversorgung (Gegenvorschlag zur Bargeldinitiative)Federal● Accepted · 73.4% Yes
70.1% YesNo 30.0%
08.03.2026Volksinitiative «Ja zu einer unabhängigen, freien Schweizer Währung mit Münzen oder Banknoten (Bargeld ist Freiheit)»Federal● Rejected · 45.6% Yes
50.7% YesNo 49.3%
08.03.2026Kantonsratsbeschluss über den Bau der «Kantonsstrasse zum See» mit Kostenbeteiligung am «Anschluss Witen mit Zubringer»Cantonal SG● Accepted · 54.0% Yes
58.2% YesNo 41.8%
Popular votes (sd-t-17-02) 2026 · Federal Statistical Office (FSO), retrieved 31.08.2026
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 31.08.2026
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 31.08.2026
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
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 31.08.2026
Electricity
ElCom · 2026Tariff H4
28.93 Rp./kWh
Energy
13.15 Rp./kWh
Grid usage
11.07 Rp./kWh
Levies + grid surcharge
3.3 Rp./kWh
28.93 Rp./kWh9.6443.61
Canton median 29.8 Rp./kWhSwiss median 27.7 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.
2026 · Federal Electricity Commission (ElCom), retrieved 28.08.2026
Housing
BFSVacancy rate
2.98 %
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 31.08.2026 · Vacant dwellings survey 2025 · Federal Statistical Office (FSO), retrieved 31.08.2026
Accessibility
ARE · NPVMNational Passenger Transport Model (NPVM) 2025 · Federal Office for Spatial Development (ARE), retrieved 28.08.2026
Municipality
Wikidata · CC0Websiteau.sg.ch ↗
Wikidata · continuously updated, retrieved 31.08.2026
Rankings
31Largest municipalities8'771 #19 SG · #226 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 turnout47.3% #73 SG · #1908 CHAgainst Switzerland18% #41 SG · #697 CHAligned with Switzerland82% #34 SG · #746 CHSVP strongholds38.8% #37 SG · #728 CHSP strongholds9.9% #33 SG · #1525 CHCentre strongholds18.1% #53 SG · #634 CHFDP strongholds14.4% #35 SG · #883 CHGLP strongholds5.8% #19 SG · #1012 CHGreen strongholds6.2% #46 SG · #1285 CHLargest by area4.7 km² #66 SG · #1594 CHHighest municipalities405 m #72 SG · #1867 CHRemotest municipalities124 min #14 SG · #152 CHBest-connected municipalities124 min #62 SG · #1953 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 CHCheapest electricity28.93 Rp./kWh #19 SG · #1264 CHMost expensive electricity28.93 Rp./kWh #57 SG · #843 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