857 Rate Centers & Exchanges
9 rate centers · Massachusetts · Eastern 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 857.
Rate Center Locations
9 centers in area code 857All Rate Centers in Area Code 857
| Rate Center |
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Boston
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Brighton
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Brookline
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Cambridge
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Dorchester
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East Boston
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Hyde Park
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Newton
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Watertown
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