England Jurisdictions 1851
Genealogy website Family Search has created a nice Google Map that let's you search for places by county, parish, hundred and province in England as they were constituted in 1851. The map should prove to be a great help for anyone who wants to search the geographical origins of ancestors from England in the 19th Century.
You can select to view the different administrative boundaries via a drop-down menu. You can also select an old Ordnance Survey map as the base layer instead of the Google Map. You can search for towns by name and it is also possible to click on the different administrative boundaries on the map to view further details about a location.