Several attorneys general, including Connecticut and Missouri, announced Tuesday that they have sent a joint letter calling on the classified advertising website to get rid of its adult services category.
Read about AG's stance
A total of 17 states are involved. The attorneys general say Craigslist is not completely screening out ads that promote prostitution and child trafficking.
The site creators pledged in 2008 to improve their policing efforts.
Other states joining the effort are Arkansas, Idaho, Illinois, Iowa, Kansas, Maryland, Michigan, Montana, New Hampshire, Rhode Island, South Carolina, Tennessee, Texas and Virginia.
San Francisco-based Craigslist did not immediately return a call.
WKYC-TV/The Associated Press