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Area code 872

Area code 872 Chicago, Illinois

Area code 872 is in Illinois, with numbers assigned in Chicago. It’s 11:14 PM there now.

State
Illinois17 area codes in Illinois
Time zone
Central11:14 PM there now
Exchanges
2791 place
Overlay
312 and 773Same area, 10-digit dialing
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Where area code 872 is

Numbers in 872 are assigned to 1 place in 2 counties: Cook County and DuPage County.

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

  • Chicago279

Phone companies in 872

279 blocks of numbers in 872 are held by 36 phone companies. The most belong to T-Mobile (73), Inteliquent (55) and AT&T Mobility (30).

A large share, about 56%, belongs to competitive and internet phone carriers; wireless networks hold 40% and local phone and cable companies 4%.

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

History and overlays

872 went into service in 2009, added to the area of 312.

312 (since 1947) and 773 (since 1996) share the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

131 new exchanges were assigned since 2021, the latest in October 2026.

Calling 872

It’s 11:14 PM Central time in 872 right now.

From elsewhere in the U.S., dial 1, 872 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 872 area code

Map of the 872 area code around Chicago, Illinois.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 872

Where is area code 872?

In Illinois, covering Chicago across 2 counties.

What time zone is 872 in?

Central time. It was 11:14 PM there when this page loaded.

Is 872 an overlay?

Yes. 312 and 773 serve the same area, so dial all 10 digits for local calls.

Which phone companies have 872 numbers?

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

Is 872 running out of numbers?

Not on record. 131 new exchanges have been assigned since 2021.