Amager, located in the Øresund, is Denmark's most densely populated island, with 225,746 inhabitants. Amager is the largest island in the Øresund, and the only one with a large population.
Zealand is the largest and most populous island in Denmark proper at 7,031 km2. Zealand had a population of 2,319,705 on 1 January 2020, comprising 40% of the country's population.
Amager
…is home to parts of Copenhagen including Freetown Christiania, as well as Copenhagen Airport. The island is connected to the much larger island of Zealand (Sjælland) by nine bridges and a metro tunnel, and to Sweden via the Øresund Bridge. The northern part of the island is covered by parts of Copenhagen…
The Cliffs of Stevns just south of Copenhagen
The Gefion Fountain in Copenhagen, showing the Norse goddess Gefjon carving Zealand from Sweden.