Maarn is a town in the municipality of Utrechtse Heuvelrug in the Dutch province of Utrecht. It is located about 10 km east of Zeist. In 2001, the town of Maarn had 4,071 inhabitants. The built-up area of the town was 1.26 km2; it contained 1,793 residences. Until 2006, Maarn was its own municipality, covering both Maarn and neighbouring Maarsbergen. Maarn is a small town in the heart of the Utrechtse Heuvelrug, a protected nature reserve in the Netherlands.