Police said the girl was found just before 1 p.m. walking alone in the 4700-block of West Fullerton avenue in the city's Belmont Cragin neighborhood.
Police said the girl has been identified but they have not said whether her family has been found. Chicago police confirmed just before 5:45 p.m. the girl had been taken into the custody of the Illinois Department of Children and Family Services.
Police said the girl is doing OK and was checked out at Community First Hospital just a couple miles northwest from where she was found.
If you have information about this incident, contact Area 5 detectives at 312-746-6554.