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Area code 773

Area code 773 Chicago, Illinois

Area code 773 is in Illinois, with numbers assigned in Chicago. It’s 11:11 PM there now.

State
Illinois17 area codes in Illinois
Time zone
Central11:11 PM there now
Exchanges
7861 place
Overlay
872Same area, 10-digit dialing
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Where area code 773 is

Numbers in 773 are assigned to 1 place in 2 counties: Cook County and DuPage County.

Chicago holds most of them: 100% of the exchanges.

  • Chicago786

Phone companies in 773

786 blocks of numbers in 773 are held by 20 phone companies. The most belong to AT&T (257), T-Mobile (173) and AT&T Mobility (84).

A mix: about 40% wireless, 33% local phone and cable and 26% other carriers, including internet phone services.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

773 went into service in 1996, added to the area of 312.

872 (since 2009) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

18 new exchanges were assigned since 2021, the latest in August 2026.

Calling 773

It’s 11:11 PM Central time in 773 right now.

From elsewhere in the U.S., dial 1, 773 and the 7-digit number; inside the area, all 10 digits too.

Nearby area codes

Illinois has 17 area codes: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 773 area code

Map of the 773 area code around Chicago, Illinois.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 773

Where is area code 773?

In Illinois, covering Chicago across 2 counties.

What time zone is 773 in?

Central time. It was 11:11 PM there when this page loaded.

Is 773 an overlay?

Yes. 872 serves the same area, so dial all 10 digits for local calls.

Which phone companies have 773 numbers?

20 companies hold blocks; the most belong to AT&T, T-Mobile and AT&T Mobility. About 40% of blocks are wireless.

Is 773 running out of numbers?

Not on record. 18 new exchanges have been assigned since 2021.