Votes were counted as the polls closed, but results were not announced until 13 and 14 June so results from one country would not influence voters in another where polls were still open; however, the Netherlands, voting on Thursday 10, announced nearly complete provisional results as soon as they were counted, on the evening of its election day, a move heavily criticized by the European Commission.

342 million people were eligible to vote, the second-largest democratic electorate in the world after India.

The national results as at 21 July 2004 are as follows: The estimated votes by EU party are as follows: Registered voters: 353,460,958 (est.)

The notional results by EU party as at 8 January 2007 are as follows: Registered voters: 378,106,633 (est.)

Roger Helmer was expelled from the EPP-ED group in 2005, but retains the whip of the British Conservative Party.

Gibraltar participated as a result of the judgement in Matthews v. United Kingdom