thedirectory - Area Code 773 History

Area Code 773 History - Illinois

Significant events for area code 773

Date
Details

October 11, 1996 Area code 312 was split with 773 covering all of the area outside of downtown Chicago.

November 7, 2009 Area code 872 was overlaid on 312 and 773.

Date	Details
October 11, 1996	Area code 312 was split with 773 covering all of the area outside of downtown Chicago.
November 7, 2009	Area code 872 was overlaid on 312 and 773.

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