Police said the women were found unresponsive in the Bucktown neighborhood's 2300-block of North Leavitt Street around 2:30 p.m. Both were pronounced dead on the scene.
The Cook County Medical Examiner's Office identified them as 36-year-old Shirley Miller Colon and 40-year-old Taina Lopez Rios.
How the women died was not immediately clear. Police classified the incident as a death investigation pending autopsy results.
Authorities did not immediately provide further information.