Coming just a month after sanctions were lifted under Iran's nuclear deal with world powers, the outcome of yesterday's vote is being seen as a de-facto referendum on President Hassan Rouhani.
A political moderate, Rouhani is hoping his alliance with reformists, called The List of Hope, can curtail conservative dominance of parliament, improving his chances of passing social and political reforms.
Early results, published by the semi-official ISNA news agency quoting electoral officials, suggested no one faction would win a majority.
The high number of independent winners could suggest a partial shift away from Iran's sharply factional politics towards the middle ground.
If that trend continues when more seats are declared it may be because voters reacted to the high number of reformist candidates who were not allowed to compete in the elections, a reform-minded analyst said.
Based on unconfirmed reports, he predicted a strong showing for the List of Hope, comprising moderates and reformists.
"What is for sure is that there will be less conservatives from the hard right in the next parliament. It won't be easy for them," Laylaz said.
Around 60 per cent of voters cast ballots - 33 million out of 55 million eligible voters - the interior ministry said. Polling stations were kept open late yesterday to allow millions of latecomers to participate.
There were no results for the Assembly of Experts election by this afternoon.
