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773 Area Code

Area code 773 serves Chicago in Illinois. It has been in service since October 12, 1996, when it was split from 312.

StateIllinois
Time zoneCentral
Local time now…
Prefixes in use786
Overlay with872
Projected to run out2046
ChicagoChicago
Cities and towns served by area code 773

Who issues 773 numbers

Mobile 40%VoIP and cable 17%Landline 43%

Share of the 786 prefixes (the three digits after 773) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Illinois Bell)257
T-Mobile169
AT&T Mobility84
Verizon Wireless59
Verizon Business (MCImetro)46
Lumen (Level 3)36
Paetec Itel33
AT&T (Teleport)23

Cities and towns in area code 773

CityPopulationOther area codes
Chicago2,731,585312, 872

Got a call from 773?

A 773 number was originally issued in Illinois, but that does not prove the caller is there. 17% of 773 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 786 prefixes in area code 773

Format: (773) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 773

Where is area code 773?
Area code 773 is in Illinois. It covers Chicago.
What time zone is area code 773?
Area code 773 is in the Central time zone.
Is 773 a toll-free number?
No. 773 is a geographic area code in Illinois. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 773 share its area with 872?
773 and 872 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 773 run out of numbers?
NANPA's latest forecast projects the 773/872 overlay to exhaust in the fourth quarter of 2046. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Illinois