Demographics
BFS · 2023Women
4'214 49.7%
Men
4'267 50.3%
Children & youth (0–19)
1'681 19.8%
Swiss citizens
5'324 61.7%
Foreign residents
3'304 38.3%
0–19 · 1'681 · 19.8%20–64 · 5'244 · 61.8%65+ · 1'556 · 18.3%
Foreign residents 38.3%0%61.6%
Source: BFS/OFS · retrieved 24.07.2026
Recent federal votes
BFS · sd-t-17-0214.06.2026Änderung des Bundesgesetzes über den zivilen Ersatzdienst (Zivildienstgesetz, ZDG)● Switzerland: accepted · turnout 53.6%61.6% yes
14.06.2026Volksinitiative «Keine 10-Millionen-Schweiz! (Nachhaltigkeitsinitiative)»● Switzerland: rejected · turnout 54.7%57.5% yes
08.03.2026Bundesgesetz über die Individualbesteuerung● Switzerland: accepted · turnout 48.4%41.3% yes
08.03.2026Volksinitiative «Für eine gerechte Energie- und Klimapolitik: Investieren für Wohlstand, Arbeit und Umwelt (Klimafonds-Initiative)»● Switzerland: rejected · turnout 48.3%17.2% yes
Source: BFS · retrieved 20.07.2026
Politics
National Council election 2023SVP38.8% · strongest party
SVP38.8%
Mitte18.1%
FDP14.4%
SP9.9%
GRÜNE6.2%
Source: BFS · retrieved 20.07.2026
Taxes 2026
ESTVMunicipal tax multiplier99%
Cantonal tax multiplier105%
99%CH range 25%525%
Tax rank 14 of 75 in canton St. GallenSource: ESTV · retrieved 20.07.2026
Climate
Altenrhein · 5.3 kmAnnual mean temperature 202510.8 °C
Precipitation 20251'033 mm
10.8 °CCH range -5.5°14°
Source: MeteoSwiss · retrieved 24.07.2026
Municipality
Wikidata · CC0Websiteau.sg.ch ↗
Source: Wikidata · retrieved 20.07.2026
Postal codes (2)
swisstopoNearby municipalities
swisstopoFrequently asked questions
- 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 many residents does Au have?
- Au has 8'481 residents (2023).
- Which canton is Au in?
- Au is located in canton SG.