Area Codes
| 872 | Illinois This Area code is scheduled to provide numbering relief to Area code 312 but no date has been assigned for this to go into effect. | More information at: Area Code 872 Phone Number Blocks
| 872 | Illinois This Area code is scheduled to provide numbering relief to Area code 312 but no date has been assigned for this to go into effect. | More information at: Area Code 872 Phone Number Blocks