[9] The parish historically covered a large rural area surrounding the hilltop settlement itself, extending to Pinner, Harrow Weald, Wealdstone and Wembley.

In 1850 a local board district was established for the central part of the parish, including the main village and the adjoining hamlets of Greenhill, Roxeth, and Sudbury.

The new town centre became known simply as Harrow to distinguish it from the older village on the hill.

[14] On 27 April 1646, King Charles I, when fleeing Oxford on his way to Southwell, where he was due to surrender to the Scottish Army, stopped at Harrow on the Hill near St Mary's Church, so that he could take a final glimpse at London and also to water his horses.

A plaque on Grove Hill near Harrow School marks the spot, and also says that the spring below has ever since been called King Charles' Well.

Hergae Mound is also a direct flight line for pipistrelle bats and barn owls - very active at dusk.

[citation needed] Harrow-on-the-Hill station, although named after the settlement, is located some distance to the north of the hill.

About equidistant to Harrow-on-the-Hill station from the top of the hill, is South Harrow on the Piccadilly line.

A roadside plaque unveiled on 25 February 1969 states that the first recorded motor accident in Great Britain to have involved the death of the car driver took place at Harrow on the Hill on a road called Grove Hill seventy years earlier, on 25 February 1899.

A rear wheel collapsed after breaking its rim and the car hit a sturdy brick wall.

[26] In the graveyard of St Mary's church is a gravestone recording the death of Thomas Port in the railway accident on 7 August 1838.