Quick guide

Use the map to compare historic counties with council areas, lieutenancies, regions and constituencies.

Use Definition A or B to switch how detached parts are shown in the historic counties base layer.

Only one comparison layer shows at a time, so each selection stays easy to read.

You can search for historic counties, places, major features and postcodes, then export or save the current view.

Sources and standards

This map conforms to the Historic Counties Standard.

• Contains border data provided by the Historic County Borders Project © Historic Counties Trust.
• Contains OpenStreetMap data © OpenStreetMap contributors.
• Contains Ordnance Survey data © Crown copyright and database right 2026.
• Contains National Statistics data © Crown copyright and database right 2026.