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Annual counts of people listed on electoral registers for the UK and its constituent countries, local government areas and parliamentary constituencies. These figures are based on people registered to vote not people eligible to vote.
The total number of UK Parliamentary electors decreased by 372,000 (0.8%) between December 2017 and December 2018, compared with an increase in the previous year.
The number of electors was at a high point in the year to December 2017, following three successive years with national polls, in contrast with the decrease in electors seen in the latest year, to December 2018.
The number of Parliamentary and local government electors decreased in England, Wales and Scotland but increased in Northern Ireland.