YouGov has produced an infographic based on the results of several extensive opinion polls, historic voting intentions and constituency turnouts to break down support for the EU by local authority areas.
It reveals the strength of support for the UK’s continued membership north of the Tweed and in London and the depth of opposition across the Midlands and North East England.
Cities such as Edinburgh and Glasgow are coloured dark red to reflect their EU support, compared to the dark blue heartlands of Brexit in former fishing hubs like Grimsby and Hull.
“Support for Leave is strongest in the eastern coastal regions around The Wash, and the Humber and Thames Estuaries, but there is another more surprising area of strength in the areas surrounding Birmingham,” said a YouGov spokesman.
“Support for Remain is strongest in London, Scotland and other major towns and cities in England.”
They added the potential Remain vote appears to be underrepresented in the map, as the most pro-EU parts of the country tend to be cities compared to the more sparsely-populated cities.
The map was published as the latest polls suggest the Remain and Leave campaigns are neck-and-neck.
Party leaders north and south of the border are making their final speeches ahead of tomorrow’s referendum.
YouGov said its model predicted there was a 95 per cent chance the final result would be between 48 and 53 per cent.
Meanwhile, four former First Ministers from three political parties made a joint statement yesterday urging Scots to back EU membership.
Henry McLeish, Jim Wallace, Jack McConnell and Alex Salmond said Scotland “must unite as a nation, turn out on Thursday and vote Remain.”
Scottish Vote Leave said the Holyrood leaders are part of a “project fear establishment” who are “out of touch with ordinary voters”.