Køge is a municipality (Danish, kommune) in Region Sjælland on the east coast of the island of Zealand (Sjælland) approx. 40 km. south of Copenhagen. The municipality covers an area of 255 km² (98 sq. miles), and has a total population of 56,637 (2008). Until January 2007, its mayor was Torben Hansen, a member of the Social Democrats (Socialdemokraterne) political party, who died while still in office. He was replaced by Marie Stærke, who at age 27 is currently Denmark's youngest mayor.
The main town and the site of its municipal council is the town of Køge. Other agglomerations in the municipality include Køge Nord (Ølby and Ølsemagle), Lille Skensved, Lellinge, Algestrup, Herfølge and Hastrup.
The oldest halftimbered house in Denmark can be found in Køge. It was built in 1527 and is now a part of the local library. Pictures can be found in the gallery.
Near the house is Sankt Nicolai Church. A lighthouse is built in the tower of the church and it was the first lighthouse in all of Denmark.
Køge's town hall is the oldest still in use as such: it dates from 1552.
During the local witchhunt, called Køge Huskors (1612), at least 15 persons were convicted of witchcraft and burned at the stake.