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.
1.30 Stirling
The first big Scottish city to declare. Expect a big Remain win – if not the UK could be heading for Brexit.
2.00 Oxford
Again should be a Remain vote. Turnout here will be interesting to see how many students have bothered to come out and vote.
2.00 Basildon
Which way will Essex man go: Probably for Brexit - but if not it will be bad news for the Leave campaign.
3.00 Hammersmith
London is expected to firmly back Remain. If they don’t or its close here expect a long night.
3.00 Torbay
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?
4.00 Birmingham
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.
4.00 Tendring
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.
7.00 Waveney
The Electoral Commission expects the final four results to come through at seven am. We should know who has one 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.
What is Brexit and why are we having an EU referendum?
Does the UK need to take more control of its sovereignty?
Could the UK media swing the EU referendum one way or another?
Will the UK benefit from being released from EU laws?
Will we gain or lose rights by leaving the European Union?
Will Brexit mean that Europeans have to leave the UK?
Will leaving the EU lead to the break-up of the UK?
What will happen to immigration if there's Brexit?
Will Brexit make the UK more or less safe?
Will the UK benefit from being released from EU laws?
Will leaving the EU save taxpayers money and mean more money for the NHS?
What will Brexit mean for British tourists booking holidays in the EU?
Will Brexit help or damage the environment?
