|— Municipality —|
|• Mayor||Helge Friis (S)|
|• Total||121.19 km2 (46.79 sq mi)|
|Population (1 January 1 2012)|
|• Density||260/km2 ( 660/sq mi)|
|Time zone||CET (UTC+1)|
|• Summer (DST)||CEST (UTC+2)|
Halsnæs Kommune is a municipality (Danish, kommune) in Region Hovedstaden ("Capital Region"). The municipality covers an area of 120 km², and has a total population of 30,824 (2008). Its name comes from Halsnæs, the peninsula that forms the western part of the municipality.
The municipality was created on January 1, 2007 as a merger of the former municipalities of Frederiksværk and Hundested. At first the merged municipality wore the hyphenated name Frederiksværk-Hundested, but it was changed to Halsnæs on January 1, 2008. Its mayor as of 2010 is Helge Friis, a member of the Social Democrats (Socialdemokraterne) political party.
Urban areas 
The ten largest urban areas in the municipality are:
- Arresødal Castle, completed in 1788, now serves as a private hospital.
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