The section had been replaced Saturday by a black and while "censored" logo.
Craigslist did not immediately return an e-mail seeking comment.
Connecticut Attorney General Richard Blumenthal, one of the AGs who pressed for the change, said in a written statement that he welcomed the change and was trying to verify Craigslist's official policy going forward.
He said if it was doing the right thing voluntarily in response to the AGs, it could set a good example for others.
In an Aug. 24 letter, the state attorneys general said Craigslist should remove the section because it couldn't adequately block potentially illegal ads promoting prostitution and child trafficking.