331 Rate Centers & Exchanges
9 rate centers · Illinois · Central Time
A rate center is the geographic unit used by phone carriers to determine local calling areas and billing. Each rate center has a specific name and set of NXX exchanges (the 3-digit prefix after the area code) assigned to it. The map below shows the 9 rate centers within area code 331.
Rate Center Locations
9 centers in area code 331All Rate Centers in Area Code 331
| Rate Center |
|---|
|
Aurora
|
|
Bartlett
|
|
Bensenville
|
|
Downers Grove
|
|
Elmhurst
|
|
Geneva
|
|
Oswego
|
|
West Chicago
|
|
Wheaton
|