
City · St. Gallen
Au is a municipality in the Wahlkreis (constituency) of Rheintal in the canton of St. Gallen in Switzerland.
Fibre
The rental vacancy rate is 2.98%, 117% above the cantonal average (1.37 %). The municipal tax multiplier (Steuerfuss) is 99%, 12% below the cantonal average (113 %) — tax-favourable. Median taxable income is CHF 57'000, 8% below the Swiss median (CHF 61'929). Au SG has 8'771 residents (2025).
Source: Swiss Federal Statistical Office (BFS).
9 apartments & houses are currently listed to buy in Au SG on Homematch. The selection updates throughout the day as agencies publish new listings.
The median asking price in Au SG is around CHF 7'937 per m². For an 80 m² property that's roughly CHF 634'946 — actual prices vary widely by neighbourhood, age and condition.
Au SG is located in the canton of St. Gallen.
Au SG has approximately 8'771 residents.
The municipal tax multiplier (Steuerfuss) in Au SG is 99% of the cantonal base rate. Note: this is a multiplier of the cantonal income tax, not an effective tax rate.
1.6 kmCHF 850'000
6 rooms · 160 m²
Untere Haldenstrasse 12A, 9430 St. Margrethen SG
5 rooms · 109 m²
Schachenstrasse 10, 9430 St. Margrethen
CHF 535'000
3.5 rooms · 70 m²
Im Hinterguet 2, 9430 St. Margrethen SG
CHF 1'090'000
4.5 rooms · 132 m²
Nöllenstrasse 2, 9443 Widnau