This is the Index of Place Names (IPN) in Great Britain as at December 2018 (published September 2019). The IPN was first produced after the 1831 Census; this new version has been greatly expanded in content and extent. Featuring over 99,000 entries, it lists the names of localities and geography areas throughout England, Scotland and Wales. New geographies added are county electoral divisions. The IPN is published annually and with an updated and informative user guide giving a full rundown and explanation of the contents (File Size - 6 MB).
Index of Place Names (September 2019) in GB