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 increased by just over 1 million (2.3%) between December 2015 and December 2016, this partly reflects high levels of public engagement with the EU referendum.
The total number of UK local government electors also increased by just over 1.1 million (2.5%) between December 2015 and December 2016.
Of the 650 parliamentary constituencies in the UK, 583 (90%) had an increase in parliamentary electors between December 2015 and December 2016.