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Boston Metro

Area Code 857: Boston, MA Local Numbers

Area code 857 is a telephone area code serving Boston, Massachusetts and surrounding metro cities including Cambridge, Somerville, and Quincy. It was created in 2001 as an overlay for the 617 area code to meet Boston's growing demand for numbers.

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857 Quick Facts

Live data

📍

Region

Boston Metro, MA

🕐

Time Zone

Eastern (ET) UTC−5

🗺️

Major Cities

Boston, Cambridge, Quincy

📞

Overlay For

Area Code 617

✅

Numbers Available

14 numbers today

All Integrations

Boston Metro

Area Code 857: Boston, MA Local Numbers

Area code 857 is a telephone area code serving Boston, Massachusetts and surrounding metro cities including Cambridge, Somerville, and Quincy. It was created in 2001 as an overlay for the 617 area code to meet Boston's growing demand for numbers.

Get an 857 Number — 2 Min Setup

See how AI calling works →

1,240+ Boston businesses already use Brilo

857 Quick Facts

Live data

📍

Region

Boston Metro, MA

🕐

Time Zone

Eastern (ET) UTC−5

🗺️

Major Cities

Boston, Cambridge, Quincy

📞

Overlay For

Area Code 617

✅

Numbers Available

14 numbers today

Area Code

Feature Answer

What is Area Code 857?

What is Area Code 857?

What is Area Code 857?

What is Area Code 857?

Area code 857 is a North American telephone area code assigned to Boston, Massachusetts and its surrounding metro area. Created in 2001 as an overlay for the 617 area code, it serves cities including Cambridge, Quincy, Somerville, Brookline, and Newton. It is a local (non-toll-free) area code in the Eastern Time Zone.

Area code 857 is a North American telephone area code assigned to Boston, Massachusetts and its surrounding metro area. Created in 2001 as an overlay for the 617 area code, it serves cities including Cambridge, Quincy, Somerville, Brookline, and Newton. It is a local (non-toll-free) area code in the Eastern Time Zone.

Boston's 617 area code, first assigned in 1947, was one of the original North American Numbering Plan codes. By 2001, rapid growth in mobile phones, fax machines, and internet dial-up had exhausted available 617 numbers. The Massachusetts Department of Telecommunications responded by introducing 857 as an overlay — meaning both codes now serve the exact same geographic territory simultaneously.

Boston's 617 area code, first assigned in 1947, was one of the original North American Numbering Plan codes. By 2001, rapid growth in mobile phones, fax machines, and internet dial-up had exhausted available 617 numbers. The Massachusetts Department of Telecommunications responded by introducing 857 as an overlay — meaning both codes now serve the exact same geographic territory simultaneously.

📍

Boston Metro, MA

⏰

Eastern (ET)

✅

14 numbers available

📅

Est. 2001

Area Code

Coverage Data

Cities & Zip Codes in Area Code 857

Cities & Zip Codes in Area Code 857

Cities & Zip Codes in Area Code 857

All cities and communities served by the 857 area code — same coverage as 617.

All cities and communities served by the 857 area code — same coverage as 617.

Get an 857 Number — 2 Min Setup

857 Area Code City Coverage

Available code

City

County

Zip Codes

Est. Businesses

Boston

Suffolk

02101 – 02137

~87,000

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Brookline

Middlesex

02138 – 02142

~12,400

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Cambridge

Middlesex

02169 – 02171

~8,700

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Newton

Norfolk

02143 – 02145

~6,200

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Quincy

Norfolk

02445 – 02447

~5,800

Get 857 number →

Somerville

Middlesex

02458 – 02468

~9,100

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Watertown

Middlesex

02471 – 02472

~3,400

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Winthrop

Suffolk

02152

~1,200

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