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US area code · Illinois

Area code 773

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.

Missed a call from +1 773?

In the 30 days to September 24, 2026, 511 unwanted calls showing a 773 number were reported to the US Federal Trade Commission, 59% of them recorded messages or robocalls. That puts 773 at #196 of 670 area codes reported.

Other218
Dropped call or no message67
Calls pretending to be government, businesses, or family and friends58
Medical & prescriptions44
Before you call back
  • If you do not know anyone in Illinois, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 773 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 773 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 773:

Illinois Bell Tel Co 257T-Mobile USA, Inc. 169New Cingular Wireless PCS, LLC 84Cellco Partnership Dba Verizon Wireless 59Mcimetro Access Transmission Services LLC 38Level 3 Communications, LLC 36

About 39% of the 800 prefixes in use belong to mobile carriers: a 773 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

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