312 Rate Centers & Exchanges
8 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 8 rate centers within area code 312.
Rate Center Locations
8 centers in area code 312All Rate Centers in Area Code 312
| Rate Center |
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Chicago Zone 01-Calumet
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Chicago Zone 01-Canal
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Chicago Zone 01-Franklin
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Chicago Zone 01-Illinois Dearborn
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Chicago Zone 01-Lakeshore
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Chicago Zone 01-Monroe
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Chicago Zone 01-Superior
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Chicago Zone 01-Wabash
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