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US area code · Illinois

872 area code

Where the 872 area code is, its overlay and how to dial a +1 872 number from anywhere.

CoversChicago, IllinoisTime zoneCentral (CT)TypeOverlay
Quick answer

The 872 area code is in Chicago, Illinois, United States (Central (CT)). To call from abroad: +1 872 555-0123. It is an overlay, so all 10 digits are dialled.

StateIllinois
Main areaChicago
Time zoneCentral (CT)
TypeOverlay
10-digit dialingRequired
In service since23-Jul-1999

The 872 area code is a geographic North American Numbering Plan (NANP) code covering Chicago, Illinois. It has been in service since 23-Jul-1999 and sits in the Central (CT) time zone.

Overlay 872 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.

872312773

How to dial a 872 number

From abroad+1 872 555-0123
Within the US / Canada1 872 555-0123
Locally (same area)872 555-0123

Other Illinois area codes

217224309312331447464618630708730773779815847861

Frequently asked questions

Where is the 872 area code?

The 872 area code is in Chicago, Illinois, United States (Central (CT)).

Is 872 an overlay area code?

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

Do I have to dial 10 digits for 872?

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

How do I call a 872 number from another country?

Dial your exit code (or +), then 1, then 872, then the number: +1 872 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 872 number does not pinpoint a street or ZIP code.

Number holders in area code 872

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 289 prefixes are in use in 872, shared by 39 companies. The largest holders:

CompanyPrefixesShare
T-Mobile USA, Inc.6623%
Onvoy, LLC5519%
New Cingular Wireless PCS, LLC2810%
Bandwidth.Com CLEC, LLC197%
Ton80 Communications, LLC134%
Fractel, LLC114%

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

Complaints about 872 numbers

Reports to the FTC, last 30 days
425
Recorded messages or robocalls
68%
Rank among area codes
#234 of 670
Most reported subjects
Other (169)
Reducing your debt (credit cards, mortgage, student loans) (128)
Calls pretending to be government, businesses, or family and friends (39)

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 872 — cities & rate centres

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