Iran says initial figures show turnout in parliamentary elections on Friday was 64%.
Interior minister Mostafa Mohammad Najjar told State TV that the high turnout slapped (Iran's) enemies in the face''.
Opposition groups had urged a boycot of the vote, which was the first to be held since a presidential election in 2009.
The BBC reports final figures for the make-up of the new parliament are expected on Monday.
State TV on Friday broadcast pictures from several polling stations in Tehran and the provinces, showing long queues. Voting was extended by three hours.
The official turnout in 2008 was 61%.