Get a local business phone number in Chattanooga, TN

Chattanooga area codes

Chattanooga city is a Census place in Hamilton County, Tennessee, with an estimated 191,496 residents in 2024. All 183 exchanges NANPA lists for its rate center are in area code 423. 423 is part of an overlay with 729, so a new local number in Chattanooga may carry any of those codes depending on which have numbers available. Chattanooga is in the Eastern and Central time zone.

According to NANPA's dialing-plan data, local calls within 423 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Chattanooga exchanges by carrier

33 carriers hold the 183 exchanges assigned to Chattanooga's rate center. Bellsouth Telecomm INC d/b/a South Central Bell Tel has the most, with 60. 119 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.

Chattanooga phone prefixes

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Chattanooga's rate center (CHATTNOOGA). The earliest assignment date recorded in the file for these codes is 2001. 14 of the 183 were assigned in 2020 or later.

When Chattanooga's exchanges were assigned

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

What makes a number local to Chattanooga

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

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

Businesses around Chattanooga

Chattanooga is part of the Chattanooga, TN-GA metro area, home to 588,000 people in 2024. County Business Patterns counted 12,621 business establishments in the Chattanooga, TN-GA metro area in 2023, employing 243,302 people. The largest sectors by establishment count are retail trade (2,004), health care and social assistance (1,504), and other services (except public administration) (1,373).

A Chattanooga number on Callata

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 Chattanooga, 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 Chattanooga, TN-GA 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.