224 area code — Northbrook, IL geographic
If a call shows area code 224, the number was issued in the Northbrook area — a code active since 2002, on Central time. The same territory is also served by its overlay code (224/847 complex). Keep in mind the code identifies where the number was registered; the person calling may be elsewhere.
The code currently holds 588 working prefixes, held by 28 different carriers. Of these, 577 are pooled prefixes shared by multiple carriers. Numbers are anchored to 41 rate centers — billing localities that fix where each prefix belongs.
The current NANPA exhaust forecast for the 224/847 complex is 3Q 2033.
The code was carved out of 847 (2002).
Local calls inside 224 are dialed 1+10D.
To check where a specific 224 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.
Largest localities in 224
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Northbrook | 71 | 312, 630, 708, 815, 847 |
| Arlington Heights | 69 | 847 |
| Des Plaines | 48 | 847 |
| Elgin | 44 | 630, 847 |
| Waukegan | 38 | 847 |
| Algonquin | 34 | 847 |
| Deerfield | 20 | 847 |
| Barrington | 19 | 847 |
| Elk Grove | 18 | 847 |
| Glenview | 14 | 847 |
FAQ
Will 224 run out of numbers?
NANPA's current forecast projects exhaust in 3Q 2033 — decades of capacity remain.
Why am I getting spam calls from 224 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 224 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 224 number from?
224 is assigned to Northbrook and surrounding areas of Illinois in the Central time zone. The three digits after the area code (the prefix) narrow it down to a rate center.