Area Code 857 is an overlay area -added to area code 617 in 2001. It covers region of Massachusetts; state of United States located in the New England region. EST (Eastern Time Zone) is the standard time zone for this area.
An overlay was added to 617 because the demands of telephone connections were increasing as a result of population growth. Overlays or area split is required when the combinations of phone number run out. Adding 3-digit code provides more combinations for telephone numbers.
Ten digit local dialing is essential because two different places -existing and overlay area might have same seven digit phone number but with different area code.
More codes for Massachusetts divisions are:
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