The biggest city is Roskilde, the municipality covers an area of 212 km2, and it has a total population of 90,931 (2024). Its current mayor is Tomas Breddam. He is a member of Socialdemokraterne.
By January 1, 2007 the former Roskilde municipality was merged with Gundsø and Ramsø municipalities into the current one, as the result of Kommunalreformen ("The Municipal Reform" of 2007). The name of the new municipality is still "Roskilde Kommune". The town hall is situated in the city of Roskilde, at Køgevej 80. It is the former county hall of Roskilde County.
Urban areas
The ten largest urban areas in the municipality are: