The 224 area code covers the same area as 847, including Northbrook, Roselle and 40 more places in Illinois.
Area code 224 is in Illinois, on Central Time. In the 224 area, phone numbers are given out most in Cook County, then Lake and DuPage counties. It has been in service since January 5, 2002. 847 covers the same area, so two neighbours can have different area codes.
- Where
- 5 counties in Illinois, mostly Cook County, Lake County and DuPage County
- Time zone
- Central Time
- In service since
- January 5, 2002
- Shares its area with
- 847 (since 1996)
- Prefixes in use
- 594
- How to dial
- Local calls need 1, then the area code, then the number: 1-224-555-0142.
Find out who called you from a 224 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 (224) number is on today, use our free carrier lookup.
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Northbrook holds 12% of the phone prefixes in area code 224.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 594 prefixes in use shows where 224 numbers are actually given out.
- Northbrook72 prefixes, 12%
- Arlington Heights70 prefixes, 12%
- Des Plaines48 prefixes, 8%
- Elgin44 prefixes, 7%
- Waukegan38 prefixes, 6%
- Algonquin36 prefixes, 6%
- Deerfield20 prefixes, 3%
- Barrington19 prefixes, 3%
Also served: Elgin, Evanston, Libertyville and La Grange and 30 smaller places.
T-Mobile holds the most phone number prefixes in area code 224: 138 of 594.
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 594 prefixes in use in 224 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| T-MobileMobile network | 138 | 23% |
| AT&T MobilityMobile network | 92 | 15% |
| Illinois Bell (AT&T)AT&T's landline company | 34 | 6% |
| Fractel | 29 | 5% |
| Level 3 (Lumen)Lumen's business and wholesale network | 19 | 3% |
| Teleport (AT&T)AT&T's business phone network | 19 | 3% |
| 20 other carriers | 263 | 44% |
98% 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.
224 started in 2002 as an overlay on 847, and its ground has not changed since.
2002
224 starts on January 5, 2002, as an overlay on 847: new numbers on the same ground.
A 224 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 224 are 630, 312 and 708.
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 224.
Where is area code 224?
224 covers Northbrook, Roselle, Arlington Heights and Waukegan and 38 more places in Illinois. In the 224 area, phone numbers are given out most in Cook County, then Lake and DuPage counties.
What state is area code 224 in?
Illinois. 224 is an Illinois area code on Central Time.
What cities use area code 224?
The places holding the most 224 prefixes are Northbrook, Roselle, Arlington Heights, Waukegan, Des Plaines, Wheeling, Skokie and Palatine, out of 42 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 224?
No single phone company owns 224. NANPA's records show T-Mobile holds the most 224 prefixes, 138 of 594, followed by AT&T Mobility and Illinois Bell (AT&T). Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 224 in?
224 is on Central Time.
When did area code 224 start?
224 went into service on January 5, 2002, as an overlay on 847: new numbers for the same area.
Is 224 the same area as 847?
Yes. 847 (since 1996) covers the same ground as 224. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 224 number?
Local calls need 1, then the area code, then the number: 1-224-555-0142.
Is 224 a toll-free number?
No. 224 is a regular area code for Northbrook and Roselle 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 224?
The closest are 630/331 (Roselle, Illinois), 312/773/872 (Chicago, Illinois), 708/464 (La Grange, Illinois) and 262 (Waukesha, Wisconsin), measured between the centres of each area.
Who called me from a 224 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 224 a scam?
224 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.