It is, without doubt, going to be a long night. The referendum results will be counted by local authority areas who will each declare their own results.
These will then be passed up to regional centres - who will declare their results - before being passed over to the central counting centre in Manchester where the final result will be declared around breakfast time on Friday.
But for those who intend to "see it through" here is The Independent's guide to the results to watch for, when to expect them - and when we could know the final answer of In or Out.
1am Newcastle and Sunderland
These cities will be among the first results to declare. They are strong Labour areas so will be important to see how successful the party has been at getting their voters to back Remain.
The first big Scottish city to declare. Expect a big Remain win – if not the UK could be heading for Brexit.
Again should be a Remain vote. Turnout here will be interesting to see how many students have bothered to come out and vote.
Which way will Essex man go: Probably for Brexit - but if not it will be bad news for the Leave campaign.
London is expected to firmly back Remain. If they don’t or its close here expect a long night.
The South West has always been traditionally Eurosceptic. But has project fear been enough to scare richer voters into sticking with the devil they know?
Being such a large area this could be a real bell weather seat giving us the first real clear indication of how the vote is likely to go. But if its neck and neck we will still be hanging on.
The most scaremongering arguments for Brexit
The most scaremongering arguments for Brexit
1/7 22 May 2015
In his regular column in The Express Nigel Farage utilised the concerns over Putin and the EU to deliver a tongue in cheek conclusion. “With friends like these, who needs enemies?”
2/7 13 November 2015
UKIP MEP for Yorkshire and North Lincolnshire Mike Hookem, was one of several political figures who took no time to harness the toxic atmosphere just moments after Paris attacks to push an agenda. “Cameron says we’re safer in the EU. Well I’m in the centre of the EU and it doesn’t feel very safe.”
3/7 19 April 2016
In an article written for The Guardian, Michael Gove attempts to bolster his argument with a highly charged metaphor in which he likens UK remaining in the EU to a hostage situation. “We’re voting to be hostages locked in the back of the car and driven headlong towards deeper EU integration.”
4/7 26 April 2016
In a move that is hard to decipher, let alone understand, Mike Hookem stuck it to Obama re-tweeting a UKIP advertisement that utilises a quote from the film: ‘Love Actually’ to dishonour the US stance on the EU. “A friend who bullies us is no longer a friend”
5/7 10 May 2016
During a speech in London former work and pensions secretary Ian Duncan Smith said that EU migration would cause an increasing divide between people who benefit from immigration and people who couldn’t not find work because of uncontrolled migration. “The European Union is a ‘force for social injustice’ which backs the ‘haves rather than the have-nots.”
6/7 15 May 2016
Cartoon character Boris Johnson made the news again over controversial comments that the EU had the same goal as Hitler in trying to create a political super state. “Napoleon, Hitler, various people tried this out, and it ends tragically.” “The EU is an attempt to do this by different methods.”
7/7 16 May 2016
During a tour of the women’s clothing manufacturer David Nieper, Boris had ample time to cook up a new metaphor, arguably eclipsing Gove’s in which he compares the EU to ‘badly designed undergarments.’ “So I just say to all those who prophecy doom and gloom for the British Business, I say their pants are on fire. Let’s say knickers to the pessimists, knickers to all those who talk Britain down.”
The local authority that covers Clacton – Douglas Carswell’s seat. Expected to be a stomping vote to Leave.
5am Glasgow and Liverpool
The votes will really be stacking up by now and it may well be possible to begin calling the night for Remain or Leave.
4.30 Great Yarmouth
A number of predominantly Eurosceptic areas, such as Great Yarmouth are not expected to declare until towards the end of the night – so even if Remain are in the lead – it could be reversed if the vote is tight.
The Electoral Commission expects the final four results to come through at 7am. We should know who has won a bit before then. But if it’s close – who knows.
The EU referendum debate has so far been characterised by bias, distortion and exaggeration. So until 23 June we we’re running a series of question and answer features that explain the most important issues in a detailed, dispassionate way to help inform your decision.