Opinion polls were predicting that candidates who want to slash the EU's powers or even abolish it could scoop up as many as a third of the seats which would be the strongest showing ever of disillusionment with the bloc.
When official returns are announced today night, they could herald changes in EU policy in areas ranging from border control and immigration to a new trade and investment agreement being negotiated with the US
The 751-seat parliament is the only popularly elected body in the 28-nation European Union. Never before have so many candidates been bent on radically curtailing the EU's powers, ending their country's membership or shutting down the union entirely.
"We believe the best people to govern Britain are the British people themselves. We believe in running our own country, being proud of our democracy, controlling our borders," UKIP leader Nigel Farage told The Associated Press in an interview. "We want our country back. It's been sold out."
"If Europe had not existed, Spanish agriculture would have disappeared," del Olmo said, citing the EU subsidies he and other farmers receive.
"For me, Europe is something of a nation because now we depend on it for almost everything," said the 57-year-old farmer from central Spain. "This is something people don't understand. They think the politicians just go there and that's it.
