Sønderborg (Danish pronunciation: [ˈsønɐˌpɒˀ] - (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 27,841 (1 January 2020),[1] in a municipality of 74,561. In recent times, Sønderborg is a center for trade, tourism, industry, and education in the region of Southern Denmark. The town is the headquarters for several industrial companies.

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
 • Urban
13.4 km2 (5.2 sq mi)
17 m (56 ft)
 • Urban
 • Urban density2,100/km2 (5,400/sq mi)
 • Municipality
Demonym(s)Sønderborgenser Sønderborger
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]


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.


Higher educationEdit

University of Southern Denmark

Sønderborg hosts several institutions of higher education. the University of Southern Denmark, University College South (Danish: University College Syd), and Business Academy SouthWes t. Due to the local economy, the University of Southern Denmark offers several types of degrees in engineering such as: mechatronics; electronics ;innovation and business; as well as degrees in economics, languages and European studies.

Secondary educationEdit

The technical school EUC Syd has a campus in Sønderborg, and offers a variety of trades programs, as well as the HTX high school diploma and the International Baccalaureate Diploma program.


Sønderborg is an economic hub in the region of Southern Denmark, with industries within electronics, manufacturing, food processing, Information Technology and telecommunications among others, with several companies headquartered in and around the town.

The high-tech industry includes the manufacturing and development of electronics, machines, industrial equipment, and software. Companies of major importance in the high-tech sector headquartered in the region include Danfoss who employs around 1000 people in Sønderborg, and 25,000 people globally.[3] Linak, headquartered in Nordborg 25km from Sønderborg, produces linear actuators for a variety of different applications, from agriculture to healthcare, and employs around 1,100 people in the region.[4] AGRAMKOW Fluid Systems, is the world leading manufacturer of filling machines and test solutions within the Appliance refrigerants and airconditions industry. Maersk container industries(MCI), a part of the Maersk group, manufactures refrigerated and refrigeration machines shipping containers, has its headquarters in Sønderborg.

Danfoss headquarters

The food processing and meat packing group, Danish Crown has a slaughterhouse located in the town of Blans, outside of Sønderborg. The slaughterhouse produces pork and meat products for consumption, and employs around 940 people.[5] BHJ is a leading supplier of animal proteins for the international food and pet food industries, with headquarters in Gråsten, outside of Sønderborg and more than 900 employees worldwide.[6]

In telecommunications, TDC A/S operates a callcenter employing roughly 370 employees. In August 2014, TDC planned to outsource around 700 full-time positions to American company Sitel, by 2015.[7]

Skyways technics, an aircraft service and repair company is headquartered at Sønderborg Airport and has 150 employees in Sønderborg and Billund.[8] Saab AB also has offices in the town, mainly focused on sales and engineering.


Alsie Express airplane

The city is served by Sønderborg Airport. The airline, Alsie Express provides flights directly to Copenhagen and seasonal flights to destinations such as Bornholm and Naples. The train station in Sønderborg, located next to Alsion, provides daily services to Fredericia and Copenhagen, as well as a direct service to Copenhagen Airport. Mols-linjen operates daily ferry services from Fynshav to Bøjden on the island of Funen , with roads connecting the town to Odense and further to Sjælland and Copenhagen.

Notable nativesEdit

KRH Sonderborg, 1962
Else Roesdahl, 2012

The ArtsEdit

Public thinking & Public ServiceEdit

Science & BusinessEdit

Johannes Iversen, 1955


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. The science park Universe (earlier known as Danfoss univers) is located just north of Sønderborg.

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 to the core under its Teuton veneer. Crossing the bridge I climbed the Dybbol – dotted with memorials 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. ^ https://www.sonderborgnyt.dk/danfoss-medarbejderne-skruer-ned-for-loenkravet/
  4. ^ https://www.linak.com
  5. ^ http://www.danishcrown.dk/Om-os/Afdelinger/DC-Pork/Blans.aspx
  6. ^ https://bhj.com/about-us/key-facts/
  7. ^ https://www.dr.dk/nyheder/penge/tdc-outsourcer-800-ansatte-i-danmark
  8. ^ https://skywaystechnics.com/company/facilities/
  9. ^ "Bang, Hermann Joachim" . Encyclopædia Britannica. 03 (11th ed.). 1911.
  10. ^ Members of the Danish Parliament Archived 26 March 2018 at the Wayback Machine retrieved 26 March 2018

External linksEdit