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US area code · Illinois

773 area code

Where the 773 area code is, its overlay and how to dial a +1 773 number from anywhere.

CoversChicago, IllinoisTime zoneCentral (CT)TypeOverlay
Quick answer

The 773 area code is in Chicago, Illinois, United States (Central (CT)). To call from abroad: +1 773 555-0123. It is an overlay, so all 10 digits are dialled.

StateIllinois
Main areaChicago
Time zoneCentral (CT)
TypeOverlay
10-digit dialingRequired
In service since29-Feb-1996

The 773 area code is a geographic North American Numbering Plan (NANP) code covering Chicago, Illinois. It has been in service since 29-Feb-1996 and sits in the Central (CT) time zone.

Overlay 773 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

773312872

How to dial a 773 number

From abroad+1 773 555-0123
Within the US / Canada1 773 555-0123
Locally (same area)773 555-0123

Cities in the 773 area code

A 773 number is usually in one of these places in Illinois — 1 county.

West Chicago Dupage

Other Illinois area codes

217224309312331447464618630708730779815847861872

Frequently asked questions

Where is the 773 area code?

The 773 area code is in Chicago, Illinois, United States (Central (CT)).

Is 773 an overlay area code?

Yes. 773 overlays the same region as 312, 872, so callers dial all 10 digits.

Do I have to dial 10 digits for 773?

Yes — dial the area code plus the seven-digit number.

How do I call a 773 number from another country?

Dial your exit code (or +), then 1, then 773, then the number: +1 773 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 773 number does not pinpoint a street or ZIP code.

Number holders in area code 773

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 800 prefixes are in use in 773, shared by 24 companies. The largest holders:

CompanyPrefixesShare
Illinois Bell Tel Co25732%
T-Mobile USA, Inc.16921%
New Cingular Wireless PCS, LLC8411%
Cellco Partnership Dba Verizon Wireless597%
Mcimetro Access Transmission Services LLC385%
Level 3 Communications, LLC365%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 773 numbers

Reports to the FTC, last 30 days
511
Recorded messages or robocalls
59%
Rank among area codes
#196 of 670
Most reported subjects
Other (218)
Dropped call or no message (67)
Calls pretending to be government, businesses, or family and friends (58)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 773 — cities & rate centres

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