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Bezirk Aarau

Aargau

Bezirk Aarau is one of 11 districts of the canton of Aargau and comprises 12 municipalities with 85'665 residents in all (BFS, 2025). A district is an administrative unit of the canton — a court and administrative area, not a postal delivery area: postal codes and localities follow delivery routes and can cross district borders.

Residents
85'665
sum of its municipalities
Municipalities
12
Switzerland
Area
104 km²
swisstopo
Density
820 /km²
sum of its municipalities
BFS district number
1901
BFS

Relief © swisstopo · TINITALY · geoland.at · LGL · IGN · swissTLM3D · swissTLMRegio

Municipalities in Bezirk Aarau

BFS · 12
Aarau
22'932Residents
Suhr
11'760Residents
Oberentfelden
9'061Residents
Gränichen
8'699Residents
Buchs
8'651Residents
Küttigen
7'025Residents
Erlinsbach
4'650Residents
Unterentfelden
4'579Residents
Muhen
4'099Residents
Hirschthal
1'772Residents
Biberstein
1'653Residents
Densbüren
784Residents
Federal Statistical Office (FSO), retrieved 24.09.2026

Votes in Bezirk Aarau

district results as published by BFS
27.09.2026Popular Initiative 'For food security – through increased sustainable domestic production, more plant-based food and clean drinking water (Food Initiative)'Federal● Rejected · 27.5% Yes
29.6% YesNo 70.4%
27.09.2026Popular Initiative 'Safeguard Swiss neutrality (Neutrality Initiative)'Federal● Rejected · 29.8% Yes
23.9% YesNo 76.1%
14.06.2026Amendment to the Civilian Service ActFederal● Accepted · 52.5% Yes
51.7% YesNo 48.3%
14.06.2026Popular initiative: 'No to Switzerland of 10 million! (Sustainability Initiative)'Federal● Rejected · 45.2% Yes
43.2% YesNo 56.8%
14.06.2026Aargauische Volksinitiative "Bildungsqualität sichern – JETZT!" vom 28. August 2024Cantonal AG● Rejected · 42.6% Yes
45.3% YesNo 54.7%
14.06.2026Verkehrsinfrastruktur-Entwicklung Raum Suhr (VERAS); Verpflichtungskredit vom 16. Dezember 2025Cantonal AG● Accepted · 54.3% Yes
67.7% YesNo 32.3%
08.03.2026Federal Act on Individual TaxationFederal● Accepted · 54.3% Yes
53.7% YesNo 46.3%
08.03.2026Popular Initiative ‘For a fair energy and climate policy: Investing for prosperity, jobs and the environment (Climate Fund Initiative)’Federal● Rejected · 29.3% Yes
31.0% YesNo 69.0%
08.03.2026Popular Initiative ‘200 francs is enough! (SBC Initiative)’Federal● Rejected · 38.1% Yes
35.4% YesNo 64.6%
08.03.2026Cash Initiative and Counter-Proposal: Deciding QuestionFederal● Rejected · 37.4% Yes
31.8% YesNo 68.2%
All federal votes →
Federal Statistical Office (FSO), retrieved 24.09.2026

Politics

National Council election 2023 · sum of its municipalities
SVP28.3% · strongest party
SVP28.3%
SP21.3%
FDP15.4%
GLP9.3%
GRÜNE9.0%
Mitte8.2%
EVP4.7%
Übrige2.8%
EDU0.9%
PdA/Sol.0.2%

Tax rate in the district

ESTV 2026
Erlinsbach (AG)
89 %
median of its municipalities
111.5 %
Buchs (AG)
118 %

A district has no tax rate of its own. Rates range from 89 % % in Erlinsbach (AG) to 118 % % in Buchs (AG) (median 111.5 % %).

Tax burden (single, CHF 100,000): 11.9 % in Erlinsbach (AG) to 13.5 % in Buchs (AG) (ESTV 2'026)

Housing

BFS
Vacancy rate
0.88 %
Dwellings
41'343
Avg. rooms
3.8
Built before 1946
17.6%

Vacancy rate: published by BFS for the district (2025) · Dwellings: sum of its municipalities (2024)

Population change

BFS · 2025 · sum of its municipalities
Population change 2025
+744 +0.9%
births
751
deaths
685
net migration
+636
BEVNAT (Statistik der natürlichen Bevölkerungsbewegung) 2025 · Federal Statistical Office (FSO), retrieved 24.09.2026

Economy

BFS · 2024 · sum of its municipalities
Jobs
63'608
Workplaces
5'889
Services share
82.6 %
Jobs by sector: Primary 535 (0.8%) · Secondary 10'509 (16.5%) · Tertiary 52'564 (82.6%)
STATENT (Statistik der Unternehmensstruktur) 2024 · Federal Statistical Office (FSO), retrieved 24.09.2026

Agriculture

BFS · 2025 · sum of its municipalities
Farms
134
Organic share
17.9 %
Farmland
2'996 ha
Landwirtschaftliche Strukturerhebung 2025 · Federal Statistical Office (FSO), retrieved 19.09.2026

Climate · Terrain

MeteoSchweiz · swisstopo
Annual mean temperature
9.6 °C
Precipitation
1'072 mm
Elevation
356–903 m
Flat share
40.6%

Climate: area-weighted over its municipalities · Terrain: swissALTIRegio 40 m, zonal over the district polygon

Energy · Accessibility

BFE · ElCom · ARE
Solar potential
523 GWh
Electricity
25.4 Rp./kWh
Public transport to centre
63 min
Road to centre
50 min

Solar potential: sum of its municipalities · Electricity: median of its municipalities (25.35–34.08 Rp./kWh, 2027). ElCom publishes a median per municipality; the district value is our median of those. · Accessibility: median of its municipalities

Where the municipalities of Bezirk Aarau rank

sum of its municipalities
MunicipalitiesLargest municipalitiesForeign residentsTax burden
Aarau2/19672/19634/196
Suhr10/19618/196122/196
Oberentfelden16/19616/196129/196
Gränichen22/19665/196118/196
Buchs23/19615/196158/196
Küttigen29/196139/19682/196
Erlinsbach49/196126/19622/196
Unterentfelden51/19635/196131/196
Muhen61/196151/196119/196
Hirschthal116/196177/19656/196
Biberstein124/196188/19650/196
Densbüren179/196180/196153/196

Postal codes in Bezirk Aarau

18
5000Aarau5004Aarau5017Barmelweid×25018Erlinsbach5022Rombach5023Biberstein5024Küttigen5025Asp5026Densbüren×25032Aarau Rohr5033Buchs AG5034Suhr5035Unterentfelden5036Oberentfelden5037Muhen5042Hirschthal5722Gränichen×25723Teufenthal AG×2

4 of these postal codes reach across the district border.

Localities in Bezirk Aarau

17
AarauAarau RohrAspBarmelweidBibersteinBuchs AGDensbürenErlinsbachGränichenHirschthalKüttigenMuhenOberentfeldenRombachSuhrTeufenthal AGUnterentfelden

Map

swisstopo · OSM

Neighbouring districts

6
Bezirk GösgenSOBezirk LenzburgAGBezirk OltenSOBezirk ZofingenAGBezirk KulmAGBezirk BruggAG

Other districts in the canton of Aargau

10
Bezirk Baden155'843Bezirk Bremgarten84'798Bezirk Brugg51'955Bezirk Kulm47'284Bezirk Laufenburg37'715Bezirk Lenzburg70'774Bezirk Muri40'375Bezirk Rheinfelden50'327Bezirk Zofingen79'112Bezirk Zurzach38'218

Frequently asked questions

Which municipalities belong to Bezirk Aarau?
Bezirk Aarau comprises 12 municipalities: Aarau, Suhr, Oberentfelden, Gränichen, Buchs, Küttigen, Erlinsbach, Unterentfelden, Muhen, Hirschthal, Biberstein, Densbüren. Together they have 85'665 residents (BFS, 2025).
Which canton is Bezirk Aarau in?
Bezirk Aarau lies in the canton of Aargau, which is divided into 11 districts.
How many people live in Bezirk Aarau?
Bezirk Aarau has 85'665 residents (BFS STATPOP, 2025) — the sum of its 12 municipalities; the largest is Aarau with 22'932.
Does Bezirk Aarau have its own tax rate?
No. Tax rates are set by municipalities. In Bezirk Aarau the municipal rate ranges from 89 % (Erlinsbach (AG)) to 118 % (Buchs (AG)).
How did Bezirk Aarau vote in the latest federal vote?
On 27.09.2026, Bezirk Aarau voted 29.6 % yes on “Popular Initiative 'For food security – through increased sustainable domestic production, more plant-based food and clean drinking water (Food Initiative)'” (Rejected) — the district figure BFS publishes.

Districts exist in 17 cantons; UR, OW, NW, GL, ZG, BS, AI, NE and GE have no such level.