In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Hargate like this:
HARGATE, a manor in Hilton township, Marston-upon-Dove parish, Derbyshire; 7½ miles SW of Derby. Pop., 16.
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 Hargate has changed, please see our redistricted information for the modern district of South Derbyshire. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Hargate and units named after it.
GB Historical GIS / University of Portsmouth, History of Hargate in South Derbyshire | 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 "Hargate".