Ølstykke is a former municipality in Region Hovedstaden. The former Ølstykke municipality covered an area of 29 km2, and had a total population of 15,358 (2005). Its last mayor was Svend Kjærgaard, a member of the Venstre (Liberal Party) political party. On 1 January 2007, Ølstykke municipality ceased to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007). It was merged with Ledøje-Smørum and Stenløse municipalities to form the new Egedal municipality. This created a municipality with an area of 126 km2 and a total population of 39,267 (2005).