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Sønderborg (Danish pronunciation: [ˈsønɐˌpɒːˀ] - (German: About this soundSonderburg ) is a Danish town in the Region of Southern Denmark. It is the main town and the administrative seat of Sønderborg Municipality (Kommune). The town has a population of 27,801 (1 January 2019),[1] in a municipality of 74,561.

Coat of arms of Sønderborg
Coat of arms
Sønderborg is located in Denmark
Location in Denmark
Coordinates: 54°54′50″N 9°47′32″E / 54.91382°N 9.79225°E / 54.91382; 9.79225Coordinates: 54°54′50″N 9°47′32″E / 54.91382°N 9.79225°E / 54.91382; 9.79225
RegionSouthern Denmark (Syddanmark)
 • MayorEric Lauritzen
 • City496.57 km2 (191.73 sq mi)
17 m (56 ft)
 • City27,801
 • Density56/km2 (150/sq mi)
 • Metro
Time zoneUTC+1 (Central Europe Time)
 • Summer (DST)UTC+2
Postal code
Area code(s)(+45) 88


Sønderborg Castle

The town of Sønderborg is home to Sønderborg Castle (Sønderborg Slot), the Royal Danish Army's Sergeant School (until 2013) and Sandbjerg Estate (Sandbjerg Gods). Sønderborg castle is in the centre of the town, and houses a museum focusing on the history and culture of the area. The museum is open all year. Sandbjerg Estate, which had belonged for many years to the Dukes of Sønderborg, and then to the Reventlow family, was donated to Aarhus University in 1954. In addition Sønderborg has a castle-like barracks built by the German military in 1906, placed centrally by Als Fjord, opposite Alsion (see picture below).

The old part of Sønderborg is on the island of Als, but some of its western suburbs have spread onto the mainland of Jutland into what had been the interior of the fort of Dybbøl.


Prior to the Second Schleswig War of 1864, Sønderborg was situated in the Duchy of Schleswig, a Danish fief, so its history is properly included in the contentious history of Schleswig-Holstein. In the 1920 Schleswig Plebiscite returned Northern Schleswig to Denmark, 43.8% of the city of Sønderborg's inhabitants voted for the cession to Denmark and 56.2% voted for remaining part of Germany.[2]


University of Southern Denmark

Both University of Southern Denmark and University College South (Danish: University College Syd) have a branch in Sønderborg.


Sønderborg (lower left) is on the Als Strait in Denmark, southwest of Copenhagen, north of the German border.

The town of Sønderborg lies on both sides of Alssund; the narrow strait between these two sides is called Als Strait (Alssund). Two road bridges connect the city across the strait: the 682-meter-long (2,238 ft) Als Strait Bridge (Alssundbro), built in 1978–1981; and the 331-meter (1,086 ft) King Christian X's Bridge (Kong Christian Xs Bro), built in 1925–1930.


Danfoss is in Nordborg, 25 km from Sønderborg


The city is served by Sønderborg Airport.


Notable nativesEdit

KRH Sonderborg, 1962
Ludvig Harboe
Else Roesdahl, 2012

Arts and ScienceEdit

Public ideasEdit

[clarification needed]



Lars Christiansen, 2007
Simon Poulsen, 2011

Panoramic viewEdit

Panoramic photo taken from Sønderborg Castle towards the harbour.


Musical InstitutionsEdit

Sønderborg is home to the South Jutland Symphony Orchestra Sønderjyllands Symfoniorkester, link to Official Site Sønderjyllands Symfoniorkester.


Sønderborg Castle is today a museum about the history of Southern Denmark.

In literatureEdit

In Chapter 4 of Erskine Childers' 1903 novel The Riddle of the Sands the protagonists, two English yachtsmen, visit Sonderburg, then under German rule: "Fascinating Sonderburg, with its broad-eaved houses of carved woodwork, each fresh with cleansing, yet reverend with age; its fair-haired Viking-like men and rosy, plain-faced women, with their bullet foreheads and large mouths; Sondenburg still Danish ro the core under its Teuton veneer. Corossing the bridge I climbed the Dybbol – dotted with menorials of that heroic defence – and thence could see the wee form and gossamer rigging of our yacht on the silver ribbon of the Sound. (...) In the old quarter I bargained over eggs and bread with a dear old lady, pink as a debutante, who made a patriotic pretence of not understanding German".


  1. ^ en BY3: Population 1 January, by urban areas The Mobile Statbank from Statistics Denmark
  2. ^ "Deutsches Historisches Museum: Fehler2". Archived from the original on 4 February 2012. Retrieved 12 December 2008.
  3. ^ Members of the Danish Parliament Archived 26 March 2018 at the Wayback Machine retrieved 26 March 2018

External linksEdit

  Media related to Sønderborg at Wikimedia Commons