Harrow-on-the-Hill is an interchange railway station in Harrow, served by suburban London Underground services on the Metropolitan line and commuter National Rail services on the London–Aylesbury line. It is 9 miles 18 chains (9.23 mi; 14.85 km) down the line from London Marylebone. Harrow-on-the-Hill is the final Metropolitan line station from Central London before the line splits with the main branch towards Watford, Chesham or Amersham and the diverged Uxbridge branch towards Uxbridge. It is located in London fare zone 5.
