In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Summerstown like this:
SUMMERSTOWN, a chapelry in Garrat hamlet, Wandsworth parish, Surrey; on the river Wandle, 1½ mile NE of Wimbledon r. station. It was constituted in 1845. Post town, Garrat, under Tooting, London SW. Rated property, £5,282. Pop., 920. Houses, 186. The property is much subdivided. The living is a p. curacy in the diocese of Winchester. Value, £195.* Patrons, Trustees. The church is in the pointed style.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Summerstown has changed, please see our redistricted information for the modern district of Wandsworth. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Summerstown and units named after it.
GB Historical GIS / University of Portsmouth, History of Summerstown, in Wandsworth and Surrey | Map and description, A Vision of Britain through Time.
Date accessed: 24th February 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Summerstown".