The Tabasco attorney general's office says the passengers died while riding in a pickup truck near the city of Jalapa.
The agency says three bodies have been identified since Friday's crash. Two were from Guatemala and another was a 15-year-old Salvadoran girl.
It says it's working with the National Institute for Migration to identify the others.
The Televisa network reported the truck was carrying as many as 20 people when the driver lost control and crashed into a creek.