The Election Commission of Pakistan (ECP) had extended the deadline from 5pm to 6pm across Pakistan.
"The Election Commission of Pakistan was successful in conducting the elections. We have a huge turnout in Punjab," commission secretary Ishtiaq Ahmed told a news conference.
Ahmed stopped short of announcing a precise figure for turnout, but said that it was "very good" across the country in general.
Supporters of rival parties accused each other of rigging, particularly in Karachi where Jamaat-e-Islami boycotted the poll after pointing the finger at Muttahida Qaumi Movement (MQM).
Addressing concerns about fraud, Ahmed said: "We will not hide anything. If we have a complaint from any polling station, we will take notice of it.
"Rest assured, there will be no compromise on the transparency of the election."
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Successful my foot