Northbrook, IL — rate center
- State
- Illinois
- Active prefixes
- 260
- Carriers
- 18
- Pooled prefixes
- 164
- LATA
- 358
- Metro area
- Chicago-Naperville-Elgin, IL-IN MSA
Northbrook is a telephone rate center in Illinois served by area codes 224, 312, 630, 708, 815, 847. A rate center is the locality the phone industry uses to anchor numbers for billing; every prefix listed below is registered here.
260 central-office prefixes are currently anchored to this rate center, held by 18 different carriers. Pooling applies to 164 of them — individual thousands-blocks may belong to different companies.
The rate center belongs to the Chicago-Naperville-Elgin, IL-IN Metropolitan Statistical Area. Routing-wise it sits in LATA 358.
Because 224, 312, 630, 708, 815, 847 all serve this territory, two Northbrook numbers can look completely different while being neighbors — check the prefix, not just the area code.
Northbrook ranks among the larger numbering localities in Illinois: 260 prefixes mean over 2,600,000 assignable numbers anchored here.
Treat this data as geography of the number, not of the caller: porting, VoIP and caller-ID spoofing all detach the two. When a call matters, hang up and call back through an official number.
Prefixes anchored to Northbrook
| Prefix | Code holder | Pooled |
|---|---|---|
| 312-209 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | Yes |
| 312-305 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | Yes |
| 312-310 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | Yes |
FAQ
What area code is Northbrook, IL?
Northbrook is served by 6 area codes — 224, 312, 630, 708, 815, 847 — which overlay the same territory.
How many prefixes does Northbrook have?
260 active NXX prefixes are anchored to this rate center in NANPA records, held by 18 carriers.
Is a call from a Northbrook prefix really from Northbrook?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.