Get a local business phone number in Antrim, NH

Antrim area codes

Antrim, in Hillsborough County, New Hampshire, had a Census-estimated population of 2,720 in July 2024. All 2 exchanges NANPA lists for its rate center are in area code 603. Antrim is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 603 are dialed as ten digits (area code plus number) and toll calls as ten digits (area code plus number).

Antrim exchanges by carrier

2 carriers hold the 2 exchanges assigned to Antrim's rate center. Merrimack CO. Telephone CO., d/b/a Contoocook Valley has the most, with 1. 2 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.

Antrim phone prefixes

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Antrim. The earliest assignment date recorded in the file for these codes is 2009. None were assigned in 2020 or later.

How local numbers work in Antrim

What a caller sees as "local" is the area code plus prefix. In Antrim, those come from the ANTRIM rate center, as recorded by NANPA.

Keeping an existing Antrim number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 603 when you pick it.

The local business market

Antrim is part of the Manchester-Nashua, NH metro area, home to 430,000 people in 2024. County Business Patterns counted 11,028 business establishments in the Manchester, NH metro area in 2023, employing 186,868 people. The largest sectors by establishment count are retail trade (1,488), construction (1,383), and professional, scientific, and technical services (1,202).

Business phone service in Antrim

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.

If you already have a number in Antrim, 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.

A 17-person team is the benchmark here, the rounded average establishment size in the Manchester, NH metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $510.00 a month and Ooma Office Pro $424.15. On Callata the same 17 people cost $339.00 a month, less than either per-seat plan.