847 area code — Northbrook, IL geographic
Area code 847 is a geographic code serving Northbrook, Illinois in the Central time zone. It has been in service since January 20, 1996. It is part of the 224/847 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 847 number can be used from anywhere — the code marks where the number was assigned.
785 central-office prefixes are currently active in this code, spread across 20 code-holding carriers. Thousands-block pooling applies to 407 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 46 distinct rate centers.
847 was created from 708 in 1996. It has since spawned 224 (2002).
NANPA projects numbering capacity for the 224/847 complex to exhaust in 3Q 2033.
Dialing: 1+10D locally, 1+10D to other codes.
Practical takeaway: the 847 label narrows geography to Illinois, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
Largest localities in 847
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Northbrook | 122 | 224, 312, 630, 708, 815 |
| Roselle | 87 | 224, 312, 331, 630, 708 |
| Arlington Heights | 38 | 224 |
| Elk Grove | 37 | 224 |
| Waukegan | 33 | 224 |
| Des Plaines | 32 | 224 |
| Wheeling | 31 | 224, 312, 630, 708 |
| Skokie | 31 | 224 |
| Palatine | 24 | 224 |
| Elgin | 23 | 224, 630 |
FAQ
Why do 224 and 847 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 224/847 complex shares one service area, and local calls are dialed with 10 digits.
Will 847 run out of numbers?
NANPA's current forecast projects exhaust in 3Q 2033 — decades of capacity remain.
Why am I getting spam calls from 847 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 847 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 847 number from?
847 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.
Is 847 a toll-free number?
No. 847 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.