The 872 area code covers the same area as 312, including Chicago, Wheeling and 4 more places in Illinois.
Area code 872 is in Illinois, on Central Time. In the 872 area, phone numbers are given out most in Cook County, then DuPage County. It has been in service since November 7, 2009. 312 and 773 cover the same area, so two neighbours can have different area codes.
- Where
- Cook County and DuPage County, Illinois
- Time zone
- Central Time
- In service since
- November 7, 2009
- Shares its area with
- 312 (since 1947) and 773 (since 1996)
- Prefixes in use
- 276
- How to dial
- Local calls need 1, then the area code, then the number: 1-872-555-0142.
Find out who called you from an 872 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (872) number is on today, use our free carrier lookup.
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Chicago holds every phone prefix in area code 872.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 276 prefixes in use shows where 872 numbers are actually given out.
- Chicago276 prefixes, 100%
T-Mobile holds the most phone number prefixes in area code 872: 66 of 276.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 276 prefixes in use in 872 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| T-MobileMobile network | 66 | 24% |
| AT&T MobilityMobile network | 28 | 10% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 19 | 7% |
| Ton80 Communications | 13 | 5% |
| Fractel | 11 | 4% |
| AT&T | 7 | 3% |
| 29 other carriers | 132 | 48% |
100% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
872 started in 2009 as an overlay on 312, and its ground has not changed since.
2009
872 starts on November 7, 2009, as an overlay on 312: new numbers on the same ground.
An 872 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 872 are 708, 630 and 847.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 872.
Where is area code 872?
872 covers Chicago, Wheeling, Hinsdale and La Grange and 2 more places in Illinois. In the 872 area, phone numbers are given out most in Cook County, then DuPage County.
What state is area code 872 in?
Illinois. 872 is an Illinois area code on Central Time.
What cities use area code 872?
The places holding the most 872 prefixes are Chicago, Wheeling, Hinsdale, La Grange, Northbrook and Roselle. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 872?
No single phone company owns 872. NANPA's records show T-Mobile holds the most 872 prefixes, 66 of 276, followed by AT&T Mobility and Bandwidth. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 872 in?
872 is on Central Time.
When did area code 872 start?
872 went into service on November 7, 2009, as an overlay on 312: new numbers for the same area.
Is 872 the same area as 312 and 773?
Yes. 312 (since 1947) and 773 (since 1996) cover the same ground as 872. Nobody's number changed when they were added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial an 872 number?
Local calls need 1, then the area code, then the number: 1-872-555-0142.
Is 872 a toll-free number?
No. 872 is a regular area code for Chicago and Wheeling in Illinois, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 872?
The closest are 708/464 (La Grange, Illinois), 630/331 (Roselle, Illinois), 847/224 (Northbrook, Illinois) and 815/779 (Rockford, Illinois), measured between the centres of each area.
Who called me from an 872 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 872 a scam?
872 is a real Illinois area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.