Key facts on polling day
Here is some key information about the vote, from the question on the ballot paper to when the results are likely to start coming in.
* What is the question?
Voters will be presented with one question: "Should the United Kingdom remain a member of the European Union or leave the European Union?" They will have two possible answers: "Remain a member of the European Union" or "Leave the European Union".
* Who can vote?
British, Irish and Commonwealth citizens over the age of 18 who live in Britain, as well as citizens of Gibraltar, are all eligible to vote provided they have registered. British nationals who have lived abroad for less than 15 years can also vote.
* Record voters
There are a total of 46,499,537 registered voters, according to the latest figures from the Electoral Commission. This is more than in last year's general election when 46,354,197 people were registered.
* When are the results expected?
Polls are open from 7:00am to 10:00pm and counting begins as soon as the last votes are cast, with the result expected early on Friday morning. The first big wave of results is expected after 2:00am (0100 GMT) Friday and another wave a couple of hours afterwards. The formal result will not be confirmed by the chief counting office until all local areas, collated into 12 regional tallies, are declared.
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