At the time the UK had already been a member of the EC for two and a half years since joining back on 1 January 1973 and was the first ever national referendum of its kind to be held in the country.

This article lists, by voting area, all the results of the referendum, each ordered into national sections.

Verification of the votes took place after the polling stations closed but counting of the votes did not start until the following morning on Friday 6 June from 09:00 BST, the day after the poll took place and presented unique challenges as large venues were required as there had been no previous experience of counting on such a large and centralised scale and took almost fourteen hours to complete.

The national result for the United Kingdom was declared just before 2300 BST on Friday 6 June 1975 by the Chief Counting Officer Sir Philip Allen at Earls Court Exhibition Centre in London.

The result saw decisive 'Yes' votes from all four old Kingdoms, Principality and Province of the United Kingdom and also saw 'Yes' majority votes from all but two counting areas to continued membership of the European Communities (Common Market) which would later become the European Union.