Polling stations opened at 8 am on Friday morning and were scheduled to close after 10 hours.
But the higher-than-expected turnout in the elections was enough to convince the Interior Ministry to extend the voting hours all around the country.
Some 55 million Iranians were eligible to cast their ballots at around 53,000 polling stations across the country.
4,844 and 161 candidates have been running for the parliament and the Assembly of Experts, respectively.
There are 290 seats in the Iranian parliament, elected by direct vote of people in nationwide election for four years.
The Assembly of Experts is also a high-ranking body that elects and oversees the activities of the leader of the Islamic Revolution.
Members of the 88-seat assembly are directly elected to office by people for an eight-year term. It holds biannual meetings to appoint a new chairman.
By Tasnim News Agency
