These emails, numbering 296, were previously provided to Select Committee on Benghazi in February, State Department Deputy spokesperson Marie Harf said.
Four American nationals, including US Ambassador to Libya J Christopher Stevens, were killed in the attack.
"The documents we make public today were provided to the Select Committee several months ago in response to its November 18th, 2014 request to the Department, as well as in response to its December 2nd, 2014 request to Secretary Clinton," she said.
"The emails we release today do not change the essential facts or our understanding of the events before, during, or after the attacks, which have been known since the independent Accountability Review Board report on the Benghazi attacks was released almost two and a half years ago," Harf insisted.
State Department is continuing to review the remainder of the 55,000 page set of Clinton's emails and will make them publicly available on the Department's Freedom of Information Act (FOIA) website on a rolling basis, she said.