Area code 224
Where 224 is, how it is dialed, which carriers hold its numbers and how many of its codes are in use, from NANPA's 10/01/2026 files.
- State
- IL
- In service
- 2002
- Assigned codes
- 594of 800 possible
- Carriers
- 28
About area code 224
Area code 224 is a geographic area code in Illinois, in service since January 5, 2002, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 224 and 847 cover the same territory, so neighbors on the same street can have different area codes. It is in the Central time zone. The places with the most assigned exchanges include Northbrook, Arlington Heights, Des Plaines, Elgin, and Waukegan. By population, its largest named places are Wheeling, Elgin, Palatine, Elk Grove, and Waukegan.
| Item | Value |
|---|---|
| State | Illinois |
| In service since | January 5, 2002 |
| Assigned by NANPA | May 1, 1998 |
| Overlay | Yes, with 847 |
| Parent area code (NANPA) | 847 |
| Time zone | Central |
| Local calls within the code | 1 plus ten digits |
| Assigned central office codes | 594 |
| Rate centers with codes | 41 |
| Carriers holding codes | 28 |
| Pooled codes | 583 |
| Codes assigned since 2020 | 192 |
| Relief planning in progress | No |
Source: NANPA NPA report and utilized central office code file, both dated 10/01/2026.
Cities and towns in area code 224
224 holds 6.6% of the 8,977 central office codes assigned in Illinois, the 10th most of the state's 17 codes. 38 Census places could be matched to rate centers with 224 exchanges; the most populous are Wheeling (154,000), Elgin (115,000), Palatine (111,000), and Elk Grove (92,996). For a storefront or service area inside 224, the place pages show which prefixes are rated local there.
| Place | Population (2024) | Area codes | Exchanges | Carriers |
|---|---|---|---|---|
| Wheeling, IL | 153,558 | 224, 312, 630, 708, 847 | 72 | 12 |
| Elgin, IL | 114,701 | 224, 630, 847 | 71 | 17 |
| Palatine, IL | 111,316 | 224, 847 | 35 | 11 |
| Elk Grove, IL | 92,996 | 224, 847 | 55 | 13 |
| Waukegan, IL | 89,643 | 224, 847 | 71 | 14 |
| Algonquin, IL | 88,915 | 224, 847 | 43 | 11 |
| Evanston, IL | 76,006 | 224, 847 | 32 | 10 |
| Arlington Heights, IL | 75,596 | 224, 847 | 108 | 18 |
| Skokie, IL | 65,850 | 224, 847 | 44 | 12 |
| Dundee, IL | 64,114 | 224, 847 | 20 | 8 |
| Des Plaines, IL | 58,832 | 224, 847 | 80 | 14 |
| Libertyville, IL | 54,674 | 224, 847 | 33 | 11 |
| Glenview, IL | 47,634 | 224, 847 | 27 | 10 |
| Bartlett, IL | 40,718 | 224, 331, 630, 847 | 30 | 10 |
| Lake Villa, IL | 39,936 | 224, 847 | 9 | 6 |
Population: Census Vintage 2024 estimates for the matched place. Exchanges and carriers: NANPA utilized code file.
Ten-digit and seven-digit dialing in 224
According to NANPA's dialing-plan data, local calls within 224 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere.
Carriers with 224 numbers
28 carriers hold the 594 central office codes assigned in 224. T-mobile USA, INC. has the most, with 138 (23%). 583 of the codes (98%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. Numbers can move between carriers through porting, so a code's holder tells you where the block started, not where every number lives now.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| T-mobile USA, INC. | 138 | 23% |
| New Cingular Wireless PCS, LLC - Il | 92 | 15% |
| Cellco Partnership d/b/a Verizon Wireless - Il | 76 | 13% |
| Onvoy, LLC | 67 | 11% |
| Illinois Bell Tel CO | 34 | 5.7% |
| Fractel, LLC | 29 | 4.9% |
| Level 3 Communications, LLC - Il | 19 | 3.2% |
| Teleport Communications America, LLC - Il | 19 | 3.2% |
| Bandwidth.com CLEC, LLC - Il | 17 | 2.9% |
| Comcast Ip Phone, LLC | 16 | 2.7% |
| First Communications, LLC | 11 | 1.9% |
| Metropcs, INC. | 11 | 1.9% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Local calling areas in 224
NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 224 has codes in 41 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.
| Rate center (NANPA) | Place | Codes |
|---|---|---|
| NORTHBROOK | Northbrook, IL | 72 |
| ARLIGTNHTS | Arlington Heights, IL | 70 |
| DESPLAINES | Des Plaines, IL | 48 |
| ELGIN | Elgin, IL | 44 |
| WAUKEGAN | Waukegan, IL | 38 |
| ALGONQUIN | Algonquin, IL | 36 |
| DEERFIELD | Deerfield, IL | 20 |
| BARRINGTON | Barrington, IL | 19 |
| ELK GROVE | Elk Grove, IL | 18 |
| WHEELING | Wheeling, IL | 15 |
| GLENVIEW | Glenview, IL | 14 |
| SKOKIE | Skokie, IL | 13 |
| LIBERTYVL | Libertyville, IL | 12 |
| ROUND LAKE | Round Lake Beach, IL | 12 |
| LAKEFOREST | Lake Forest, IL | 11 |
| ROSELLE | Roselle, IL | 11 |
| PALATINE | Palatine, IL | 11 |
| EVANSTON | Evanston, IL | 10 |
| MUNDELEIN | Mundelein, IL | 10 |
| ZION | Zion, IL | 8 |
| HALF DAY | not matched | 8 |
| FOX LAKE | Fox Lake, IL | 7 |
| ANTIOCH | Antioch, IL | 7 |
| HUNTLEY | Huntley, IL | 7 |
| DUNDEE | Dundee, IL | 7 |
Top 25 of 41 rate centers.
How full is area code 224?
An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 594 are assigned in 224, 74% of 800. 192 were assigned in 2020 or later.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 170 | 30% |
| 2010s | 211 | 37% |
| 2020s | 192 | 34% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
Getting a 224 number for your business
Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.
If you already have a number in area code 224, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
Frequently asked questions
Where is area code 224?
224 is a geographic area code in Illinois. Places with the most assigned exchanges include Northbrook, Arlington Heights, Des Plaines, and Elgin.
What time zone is area code 224 in?
NANPA lists 224 in the Central time zone.
When did area code 224 go into service?
NANPA records an in-service date of January 5, 2002. The code was assigned on May 1, 1998.
Is 224 an overlay area code?
Yes. It shares its territory with 847.
Can my business get a 224 phone number?
Callata includes up to 3 local numbers on its $99/month plan (5 users included). Which 224 numbers are open depends on carrier inventory when you choose, and you can port an existing number for free.