Reersø Postal Codes: 4281 | Kalundborg, Sjælland

Key Facts

Reersø is a small peninsula and former island located in Kalundborg Municipality on the northwestern coast of Sjælland, Denmark. Situated approximately 110 kilometers west of Copenhagen, this unique geographical feature is connected to the mainland by a narrow causeway built in the 19th century. With an area of just under 5 square kilometers and a population of around 160 residents, Reersø maintains a quiet, rural character despite its proximity to larger urban centers. The peninsula is administratively part of Kalundborg Municipality and contains no further sub-divisions, functioning as a single cohesive settlement area. Historically an independent island until land reclamation projects created the permanent connection, Reersø's landscape is characterized by flat agricultural land and coastal meadows, with its highest point reaching only about 10 meters above sea level. The local economy traditionally revolved around fishing and agriculture, though today it serves primarily as a residential and recreational area. For those seeking postal code information for properties and addresses within this distinctive coastal community, detailed location data is available through municipal records.