Demographics
BFS · 2023Women
9'407 50.3%
Men
9'308 49.7%
Children & youth (0–19)
3'125 16.7%
Swiss citizens
12'951 68.0%
Foreign residents
6'100 32.0%
0–19 · 3'125 · 16.7%20–64 · 12'116 · 64.7%65+ · 3'474 · 18.6%
Foreign residents 32.0%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 61.1%43.5% yes
14.06.2026Volksinitiative «Keine 10-Millionen-Schweiz! (Nachhaltigkeitsinitiative)»● Switzerland: rejected · turnout 61.7%31.3% yes
08.03.2026Bundesgesetz über die Individualbesteuerung● Switzerland: accepted · turnout 55.9%65.5% yes
08.03.2026Volksinitiative «Für eine gerechte Energie- und Klimapolitik: Investieren für Wohlstand, Arbeit und Umwelt (Klimafonds-Initiative)»● Switzerland: rejected · turnout 55.8%42.3% yes
Source: BFS · retrieved 20.07.2026
Politics
National Council election 2023SP25.6% · strongest party
SP25.6%
GRÜNE19.5%
SVP16.0%
FDP15.7%
Mitte11.3%
Source: BFS · retrieved 20.07.2026
Taxes 2026
ESTVMunicipal tax multiplier108%
Cantonal tax multiplier104%
108%CH range 25%525%
Tax rank 15 of 104 in canton SolothurnSource: ESTV · retrieved 20.07.2026
Climate
Gösgen · 6.9 kmAnnual mean temperature 202510.9 °C
Precipitation 20251'008 mm
10.9 °CCH range -5.5°14°
Source: MeteoSwiss · retrieved 24.07.2026
Municipality
Wikidata · CC0Websiteolten.ch ↗
Source: Wikidata · retrieved 20.07.2026
Postal codes (3)
swisstopoNearby municipalities
swisstopoFrequently asked questions
- What is the postal code of Olten?
- Olten has 3 postal codes: 4600, 4612, 4663.
- What is the tax rate in Olten?
- The municipal tax multiplier of Olten is 108% (2026); canton SO levies 104%.
- How many residents does Olten have?
- Olten has 18'715 residents (2023).
- Which canton is Olten in?
- Olten is located in canton SO.