Get a local business phone number in Guilford, CT

What area code is Guilford, CT?

With 22,264 residents in the Census 2024 estimate, Guilford sits in South Central Connecticut Planning Region, Connecticut. NANPA lists 11 exchanges for its rate center across 2 area codes; 203 has the most (8, 73%). 203 is part of an overlay with 475, so a new local number in Guilford may carry any of those codes depending on which have numbers available. Guilford is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 203 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Who holds Guilford phone exchanges

7 carriers hold the 11 exchanges assigned to Guilford's rate center. Southern New England Telco d/b/a Frontier Comm of CT has the most, with 3. 9 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.

Local prefixes for Guilford

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Guilford. The earliest assignment date recorded in the file for these codes is 2019. 2 of the 11 were assigned in 2020 or later.

When Guilford's exchanges were assigned

Assignment dates show when each block of Guilford numbers was added to the local supply.

Rate centers and local calling in Guilford

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

If your business already has a Guilford number, porting it to Callata is free and keeps it on your cards, listings and vehicles.

Who does business near Guilford

Guilford is part of the New Haven, CT metro area, home to 577,000 people in 2024. County Business Patterns counted 13,779 business establishments in the New Haven, CT metro area in 2023, employing 263,675 people. The largest sectors by establishment count are health care and social assistance (1,958), retail trade (1,860), and other services (except public administration) (1,537).

Setting up a Guilford business line

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 Guilford, 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 19-person team is the benchmark here, the rounded average establishment size in the New Haven, CT metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $570.00 a month and Ooma Office Pro $474.05. On Callata the same 19 people cost $379.00 a month, less than either per-seat plan.