Demographics
BFS · 2023Women
11'196 50.2%
Men
11'094 49.8%
Children & youth (0–19)
4'022 18.0%
Swiss citizens
17'397 76.6%
Foreign residents
5'313 23.4%
0–19 · 4'022 · 18.0%20–64 · 14'162 · 63.5%65+ · 4'106 · 18.4%
Foreign residents 23.4%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 66.2%43.8% yes
14.06.2026Volksinitiative «Keine 10-Millionen-Schweiz! (Nachhaltigkeitsinitiative)»● Switzerland: rejected · turnout 66.9%30.4% yes
08.03.2026Bundesgesetz über die Individualbesteuerung● Switzerland: accepted · turnout 62.7%63.7% yes
08.03.2026Volksinitiative «Für eine gerechte Energie- und Klimapolitik: Investieren für Wohlstand, Arbeit und Umwelt (Klimafonds-Initiative)»● Switzerland: rejected · turnout 62.4%42.4% yes
Source: BFS · retrieved 20.07.2026
Politics
National Council election 2023SP28.4% · strongest party
SP28.4%
SVP18.2%
FDP14.8%
GRÜNE12.8%
GLP11.1%
Source: BFS · retrieved 20.07.2026
Taxes 2026
ESTVMunicipal tax multiplier96%
Cantonal tax multiplier103%
96%CH range 25%525%
Tax rank 35 of 196 in canton AargauSource: ESTV · retrieved 20.07.2026
Climate
Buchs / Aarau · 2.2 kmAnnual mean temperature 202510.9 °C
Precipitation 20251'065 mm
10.9 °CCH range -5.5°14°
Source: MeteoSwiss · retrieved 24.07.2026
Municipality
Wikidata · CC0Websiteaarau.ch ↗
Source: Wikidata · retrieved 20.07.2026
Postal codes (3)
swisstopoNearby municipalities
swisstopoFrequently asked questions
- What is the postal code of Aarau?
- Aarau has 3 postal codes: 5000, 5004, 5032.
- What is the tax rate in Aarau?
- The municipal tax multiplier of Aarau is 96% (2026); canton AG levies 103%.
- How many residents does Aarau have?
- Aarau has 22'290 residents (2023).
- Which canton is Aarau in?
- Aarau is located in canton AG.