Coat of arms of Solothurn canton, Switzerland

Solothurn

(Solothurn · Cantó de Solothurn · Solothurn)

Canton · Administrative region

Capital: Solothurn

257 007
Population
790 km²
Area
10
Districts
Official language: German

Cities & Towns

Top 175 places

Solothurn covers 790 km² , divided into 10 districts, with Solothurn as its capital city. Around 257 007 people live here, giving a population density of 325 per km² The largest city is Olten, with 17 280 residents. Click a district on the map to open its page.

Maps & Downloads

SVG and PNG, 600 px
Solothurn canton map with district boundaries, Switzerland

Solothurn canton map with district boundaries, Switzerland

Canton boundary with all district borders

Switzerland map with Solothurn canton highlighted

Switzerland map with Solothurn canton highlighted

All 26 cantons, this one highlighted

Solothurn canton outline map, Switzerland

Solothurn canton outline map, Switzerland

Clean solid-fill outline shape

Districts

10 districts

Solothurn is split into 10 districts. The largest is Bezirk Thal at 139 km², and the smallest is Bezirk Solothurn at 6 km² Bezirk Wasseramt has the highest building count in OSM, with 24 167 recorded structures.

District Population Area (km²) Buildings Postcodes
Bezirk Thal 12 120 139 8 848 11 Open
Bezirk Lebern 41 934 117 21 034 20 Open
Bezirk Thierstein 14 862 102 8 589 17 Open
Bezirk Olten 52 315 81 21 355 18 Open
Bezirk Wasseramt 49 374 77 24 167 17 Open
Bezirk Dorneck 17 579 75 11 260 14 Open
Bezirk Gösgen 23 685 69 11 054 15 Open
Bezirk Bucheggberg 6 994 63 6 466 17 Open
Bezirk Gäu 21 545 62 8 828 10 Open
Bezirk Solothurn 16 599 6 6 933 5 Open

Postcodes

122 postcode areas

Solothurn has 122 postcode areas, covering roughly 3 409 km² and 253 598 mapped buildings. Postcodes in Solothurn start with 4 / 5 / 2 / 3 (covering 4xxx, 5xxx, 2xxx, 3xxx), placing the canton in these Swiss postal zones. The most built-up postcode is 4600, with around 4 465 buildings. The map shades each postcode area by code number, so you can see at a glance how the Solothurn postal zones are laid out geographically.

122
Total postcodes
253 598
Buildings
3 409 km²
Total area
570
Avg. buildings
7.7 km²
Avg. area
707
Cities covered
4
Prefix zones
Colour by

Map legend

Jump to postcode

Postcodes by building count

# Code Name Buildings Population Area km²
1 n/a 4 465 10 550 11.49
2 n/a 2 708 21 774 6.93
3 n/a 2 398 11 490 11.85
4 n/a 2 388 459 5.79
5 n/a 2 004 8 178 6.76
6 n/a 1 822 5 654 5.53
7 n/a 1 822 3 348 6.96
8 n/a 1 771 4 664 13.24
9 n/a 1 717 4 810 4.41
10 n/a 1 666 6 090 7.6
11 n/a 1 636 5 830 5.29
12 n/a 1 612 3 607 6.04
13 n/a 1 528 156 4.32
14 n/a 1 349 8 187 9.86
15 n/a 1 137 2 151 5.84
16 n/a 1 109 5 271 5.43
17 n/a 1 059 3 499 4.48
18 n/a 1 001 2 234 10.31
19 n/a 867 868 9.42
20 n/a 861 4 077 16.31

Postal services in Solothurn

Solothurn has 1437 mapped postal facilities: 192 post offices, 1245 post boxes. Swiss Post runs a wide network of branches and automated MyPost 24 parcel lockers across the canton.

4656 Starrkirch-Wil · 4656 Starrkirch-Wil
Die Post
Die Post · 4710 Balsthal
Die Post
Filiale Arlesheim · 4144 Arlesheim
Filiale Breitenbach · 4226 Breitenbach
Filiale Bättwil-Flüh · 4112 Bättwil-Flüh
Filiale Dornach-Arlesheim · 4143 Dornach
Filiale Olten 4 Hammer
Messen
Post
Post

Transport

60 lines, 231 routes

Click a route on the map to see its details.

By mode

bus 59 lines
aerialway 1 line

Network overview

Lines 60
Routes 231
Total network length 2355.3 km
Operators 9
Longest line 129: 197.8 km
Most stops 501: 67 stops

Solothurn has 2355.3 km of public transport routes across 60 lines and 231 services, run by 9 operators.

Full transport breakdown

Population and Building Density

by municipality (Gemeinde borders)

Summary

Hover over a municipality to see its figures.

Public Holidays

10 holidays in 2026 & 2027

Solothurn observes 5 public holidays in 2026. Alongside the Swiss national holidays, Solothurn has 1 canton-specific holiday.

Date Holiday Day Scope
01.01.2026 New Year's Day Thursday National
03.04.2026 Good Friday Friday Canton
14.05.2026 Ascension Day Thursday National
01.08.2026 National Day Saturday National
25.12.2026 Christmas Day Friday National

Heraldry

Official heraldry, free to download

These are the official heraldic symbols of Solothurn. The images come from Wikimedia Commons and can be downloaded below in SVG (scales to any size) or PNG (600 x 600 px).

Questions about Solothurn

Quick answers
What is the capital city of Solothurn?

The capital of Solothurn is Solothurn, with around 16 599 residents.

How many people live in Solothurn?

Around 257 007 people call Solothurn home, spread across 790 km².

How big is Solothurn?

Solothurn takes up 790 km², which is roughly 305 square miles.

Is Solothurn a canton or a city?

Solothurn is a canton, one of 26 member states of the Swiss Confederation. Each one has its own constitution, parliament, government, and courts. Its administrative capital is Solothurn.

What language is spoken in Solothurn?

The official language of Solothurn is German.

How many districts does Solothurn have?

Solothurn is divided into 10 districts (Bezirke). These include Bezirk Thal, Bezirk Lebern, Bezirk Thierstein, Bezirk Olten, Bezirk Wasseramt and 5 more , each forming a second-level administrative subdivision of the canton.

What postal codes does Solothurn use?

Solothurn uses 122 postal code areas. Swiss codes are always 4 digits long. Codes here start with 4, 5, 2, 3.