Area code 729

Where area code 729 is

NANPA lists 729 as an in-service geographic area code for Tennessee, first put into service on September 5, 2025. It is an overlay: 729 and 423 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern and Central time zone.

Dialing 729 numbers

According to NANPA's dialing-plan data, local calls within 729 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 dialing permissible at service providers discretion"

A new code in an overlay

NANPA's utilized-code file dated 10/01/2026 lists no central office codes assigned in 729 yet. NANPA assigned the code on June 2, 2023 and put it in service on September 5, 2025. In an overlay, numbers for the shared territory keep coming from the older code (423) until carriers start drawing codes from 729, so a business phone number requested here today will most likely carry 423.

423 has been in service since September 11, 1995 and has 764 assigned codes held by 55 carriers across 75 rate centers. Its largest code holders are Bellsouth Telecomm INC d/b/a South Central Bell Tel (119), United Telephone-southeast-tn d/b/a Centurylink - TN (83), and New Cingular Wireless PCS, LLC - Ga (80). Its most populous matched places are Chattanooga (191,000), Johnson City (73,635), Kingsport (57,109), and Cleveland (50,232).

An overlay leaves existing numbers unchanged and adds a second code for new numbers in the same territory. Local calls there need all ten digits, so businesses should print their full number everywhere.

Places in the 729/423 territory

48 Census places are matched to rate centers with exchanges in 423, the code 729 overlays. The most populous are Chattanooga (191,000), Johnson City (73,635), Kingsport (57,109), and Cleveland (50,232). Their pages list the prefixes and carriers that serve each town today; numbers from 729 will appear alongside them as carriers draw new codes.

Using area code 729 for business calls

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If you already have a number in area code 729, 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.

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