Postcode area · Altstätten · St. Gallen

9450 Altstätten SG (Altstätten): key figures

9450 Altstätten SG (postcode area in Altstätten) has 11,759 residents in 2025 across 28.2 km², or 416 people per km². Population: +12.9% between 2015 and 2025.

  • 11,759 residents
  • 28.2 km²
  • 416 people/km²

9450 Altstätten SG in numbers

Population
11,759
ranked 170 of 2,275
+12.9%between 2015 and 2025
2015–2025
Population density
416people/km²
ranked 832 of 2,275
Area
28.2km²
ranked 287 of 3,168
Share of foreign nationals
33.9%
ranked 286 of 2,040
Dwellings
6,193
ranked 165 of 3,164
Residential buildings
2,832
ranked 31 of 3,160
Dwellings in buildings built before 1946
25.9%
ranked 1,707 of 3,164

Key points

Nationally, 9450 Altstätten SG ranks No. 170 of 2,275 postcode areas.

Population of 9450 Altstätten SG over time

10,00010,50011,00011,50012,0002015202020232025
Population, 2015–2025

9450 Altstätten SG had 10,413 residents in 2015 and 11,759 in 2025.

YearPopulation
201510,413
202010,882
202311,446
202511,759

All indicators for 9450 Altstätten SG

Next to the value for 9450 Altstätten SG: all postcode areas of Altstätten, then of the whole country (totals for counts, weighted averages for rates).

9450 Altstätten SGNational medianHover over or tap a bar to see what it shows.

Housing

Indicator9450 Altstätten SGAltstättenSwitzerlandPosition?Rank in the areaRank in the country
Dwellings (2026)6,193––ranked 1 of 2ranked 165 of 3,164
Residential buildings (2026)2,832––ranked 1 of 2ranked 31 of 3,160
Dwellings in buildings built before 1946 (2026)25.9%25.9%23.2%ranked 2 of 2ranked 1,707 of 3,164
Dwellings in buildings built since 2001 (2026)29.5%29.7%23.6%ranked 2 of 2ranked 843 of 3,164
Share of detached houses among residential buildings (2026)75.9%76.9%63.5%ranked 2 of 2ranked 939 of 3,160

Energy

Indicator9450 Altstätten SGAltstättenSwitzerlandPosition?Rank in the areaRank in the country
Oil or gas heating systems (2026)50.3%48.4%56.2%ranked 1 of 2ranked 1,533 of 3,160
Heat pumps as main heating (2026)31.0%32.1%16.2%ranked 2 of 2ranked 361 of 3,160
Wood heating systems (2026)10.8%12.2%13.5%ranked 2 of 2ranked 2,000 of 3,160
District heating (2026)7.4%6.7%5.6%ranked 1 of 2ranked 495 of 3,160

Society

Indicator9450 Altstätten SGAltstättenSwitzerlandPosition?Rank in the areaRank in the country
Share of foreign nationals (2025)33.9%33.9%29.8%ranked 1 of 2ranked 286 of 2,040

Where is 9450 Altstätten SG?

Other postcode areas in Altstätten

Postcode areas near 9450 Altstätten SG

Next in alphabetical order: 9452 Hinterforst

The postcode areas of Altstätten

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Frequently asked questions

What is the population of 9450 Altstätten SG (Altstätten)?

9450 Altstätten SG has 11,759 residents in 2025. It covers 28.2 km², or 416 people per km².

Where is 9450 Altstätten SG?

9450 Altstätten SG (postcode area) is part of Altstätten, in St. Gallen.

What is the value of “Share of foreign nationals” in 9450 Altstätten SG?

Share of foreign nationals: 33.9% (2025), ranked 286 of 2,040 postcode areas in the country.

What is the value of “Dwellings” in 9450 Altstätten SG?

Dwellings: 6,193 (2026), ranked 165 of 3,164 postcode areas in the country.