Nordborg

Nordborg
Town
Nordborg Castle
Nordborg
Location in Denmark
Nordborg
Nordborg (Region of Southern Denmark)
Coordinates: 55°3′32″N 9°44′53″E / 55.05889°N 9.74806°E / 55.05889; 9.74806
CountryDenmark
RegionSouthern Denmark
MunicipalitySønderborg
Area
  Urban
5.24 km2 (2.02 sq mi)
Population
 (2025)
  Urban
5,680
  Urban density1,100/km2 (2,800/sq mi)
  Gender
2,838 males and 2,842 females
Time zoneUTC+1 (CET)
  Summer (DST)UTC+2 (CEST)
Postal code
DK-6430 Nordborg

Nordborg (German: Norburg), is a town with a population of 5,680 (1 January 2025), which was the seat of the former Nordborg municipality (Danish, kommune) in Sønderborg Municipality, Region of Southern Denmark on the northwest half of the island of Als off the east coast of the Jutland peninsula in south Denmark.

Within the town is Nordborg Castle, a historic castle whose premises are currently used as a boarding school.

The town has been greatly influenced by the presence of Danfoss, a global producer of components for refrigeration and airconditioning, heating and motion control applications, headquartered in the town and founded in 1933.