Turnout in the referendum fell narrowly short of the UK record for the total number of people voting.
The Electoral Commission said 72.2% of those registered cast eligible votes - some 33,568,184.
That is just short of the 33,614,074 who decided the 1992 general election.
The highest post-war turnout was 83.9% in the 1950 general election, but a smaller population meant that was only 28,771,124 votes.