The station was built by the Midland Railway as simply "Mill Hill" in 1868 on its extension to St. Pancras, being renamed in 1950. The station was rebuilt in the 1960s in connection with the construction of the M1 motorway. Since 1 April 2006 train services have been operated by First Capital Connect. From March 2009, Southeastern and First Capital Connect began running some peak hour trains from Sevenoaks to Luton, though in the off-peak these services turn back at Kentish Town.