Area code 857

Where area code 857 is

Area code 857 is a geographic area code in Massachusetts, in service since May 2, 2001, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 857 and 617 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone. The places with the most assigned exchanges include Boston, Cambridge, Brookline, Newton, and Quincy. By population, its largest named places are Boston, Cambridge, Quincy, Newton, and Somerville.

Places served by 857

857 holds 7.6% of the 4,743 central office codes assigned in Massachusetts, the 7th most of the state's 9 codes. 12 Census places could be matched to rate centers with 857 exchanges; the most populous are Boston (673,000), Cambridge (121,000), Quincy (103,000), and Newton (90,700). For a storefront or service area inside 857, the place pages show which prefixes are rated local there.

Dialing 857 numbers

According to NANPA's dialing-plan data, local calls within 857 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at service provider discretion"

Who holds 857 exchanges

41 carriers hold the 362 central office codes assigned in 857. Cellco Partnership d/b/a Verizon Wireless - Ma has the most, with 67 (19%). 355 of the codes (98%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. Numbers can move between carriers through porting, so a code's holder tells you where the block started, not where every number lives now.

Rate centers and towns in 857

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 857 has codes in 21 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.

Number supply in 857

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 362 are assigned in 857, 45% of 800. 90 were assigned in 2020 or later.

A local 857 number on Callata

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

If you already have a number in area code 857, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.