Get a local business phone number in Waltham, MA

Waltham area codes

Waltham, in Middlesex County, Massachusetts, had a Census-estimated population of 65,849 in July 2024. NANPA lists 83 exchanges for its rate center across 3 area codes; 781 has the most (72, 87%). 781 is part of an overlay with 339, so a new local number in Waltham may carry any of those codes depending on which have numbers available. Waltham is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 781 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Who holds Waltham phone exchanges

15 carriers hold the 83 exchanges assigned to Waltham's rate center. Verizon New England INC. has the most, with 28. 50 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.

Waltham phone prefixes

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Waltham. The earliest assignment date recorded in the file for these codes is 2001. 2 of the 83 were assigned in 2020 or later.

When Waltham's exchanges were assigned

The table groups Waltham's exchanges by the decade NANPA recorded them as assigned.

Rate centers and local calling in Waltham

NANPA ties every exchange to a rate center. For Waltham that is WALTHAM, so a number from one of these exchanges reads as local to people in and around Waltham.

New local numbers are drawn from carrier inventory, so the exact 781 numbers available change over time; porting an existing number is free.

Businesses around Waltham

Waltham is part of the Boston-Cambridge-Newton, MA-NH metro area, home to 5.0 million people in 2024. County Business Patterns counted 133,807 business establishments in the Boston, MA-NH metro area in 2023, employing 2,681,704 people. The largest sectors by establishment count are professional, scientific, and technical services (17,803), retail trade (15,568), and health care and social assistance (15,127).

Setting up a Waltham business line

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

Porting a number you already use in Waltham is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.

Per-seat phone plans multiply by headcount. For the rounded average establishment size in the Boston, MA-NH metro area, 20 users on RingCentral RingEX Core come to $600.00 a month and on Ooma Office Pro $499.00, at month-to-month list prices checked September 28, 2026. Callata comes to $399.00 a month for 20 users ($99 a month with 5 users included, then $20 per additional user), below both.