615 Area Code: Nashville and the 629 Overlay

The essentials

615 area code: quick facts

How 615 became Nashville's code

1. January 1954: Area code 615 opens. The FCC lists the opening date, and the TRA's 2013 order says the 615 area was created in 1954.
2. November 22, 1994: A Bellcore letter from the North American Numbering Plan Administration announces the split of 615, citing number growth in the central and eastern sections of the state.
3. September 11, 1995: The split takes effect. The Nashville LATA (a long-distance service area) keeps 615, and the Chattanooga, Knoxville, and Johnson City LATAs move to the new 423. Callers could use either code for numbers in the 423 area until February 26, 1996. The FCC lists 423 as opened in September 1995.
4. September 15, 1997: 615 splits again. NANPA's August 15, 1997 planning letter says the plan, approved by the Tennessee Public Service Commission, kept 615 for the Nashville Metropolitan Calling area plus Cannon, DeKalb, Dickson, Macon, Smith, and Trousdale counties. The rest of the 615 area moved to 931. The permissive period ended on January 19, 1998. The FCC lists 931 as opened in September 1997.
5. July 17, 2000: NANPA tells the TRA that it has declared the 615 area code in jeopardy, meaning numbers could run short.
6. March 14, 2002: Mandatory thousand-block number pooling begins in 615, after technical problems delayed a December 2000 order (TRA).
7. January 31, 2011: NANPA files a petition with the TRA on behalf of the Tennessee telecommunications industry, recommending an all-services overlay (Docket No. 11-00018).
8. October 21, 2013: A TRA panel votes unanimously to approve the overlay. The written order is dated October 23, 2013.
9. July 26, 2014: Permissive ten-digit dialing begins, so callers can use seven or ten digits for local calls (NANPA).
10. February 28, 2015: Ten-digit dialing becomes mandatory for local calls in 615 and 629.
11. March 28, 2015: The earliest date for activating central office codes in the new 629 area code. The FCC lists 629 as opened in March 2015.

Where area code 615 is used

The TRA's 2013 order says the 615 area covers the north-central portion of the state and is made up of 49 rate centers. A rate center is a billing area, not a boundary. NANPA's planning letter for the overlay names communities such as Franklin, Gallatin, Hendersonville, Lebanon, Murfreesboro, Nashville, and Springfield, and says 629 serves the same geographic area as 615.

The rate center map attached to that letter, dated October 2013, also labels Dickson, Smyrna, LaVergne, Goodlettsville, Portland, Nolensville, Carthage, Smithville, Lafayette, and Hartsville, among others. The Nashville rate center is by far the largest: the order notes that it alone accounted for 406 of the 682 central office codes assigned in 615 when the petition was filed in 2011.

The sources checked do not give a current official county list for 615. The 1997 planning letter described the area as the Nashville Metropolitan Calling area plus six named counties, and county lines and rate centers do not match exactly. Confirm a specific address with your phone provider.

Why 615 added a code

Both splits were driven by demand. The 1994 Bellcore letter cited "substantial telephone number growth in the central and eastern sections of Tennessee," and the 1997 letter cited "continued telephone number growth throughout the state." After 931 was carved out, the TRA used number conservation first: NANPA declared 615 in jeopardy in July 2000, and the TRA ordered thousand-block pooling, which began in March 2002 after delays.

In October 2010, NANPA told the TRA and the industry that relief was needed again. The industry studied three options, according to the order:

• An all-services overlay across the whole 615 area, with a projected life of nineteen years. Customers keep their numbers, but all local calls need ten digits.
• A split with the boundary drawn around the Nashville rate center. Nashville would have had a projected life of thirteen years and the rest of 615 twenty-eight years.
• A concentrated overlay on the Nashville rate center only, which would have needed expanding in 1.7 years.

The projected run-out date moved while the petition was pending. NANPA forecast the fourth quarter of 2013 when it filed, the third quarter of 2016 in October 2011, and the second quarter of 2015 at the time of the order. The TRA ran a public survey and received about 3,000 responses, with 83.2% preferring the overlay. The panel found that the overlay would cause the least disruption and approved it with a fifteen-month implementation schedule.

NANPA's April 2026 analysis, based on data as of March 1, 2026, projects that the combined 615/629 area will run out of numbers in the third quarter of 2057. Earlier editions gave the first quarter of 2047 (April 2025) and the third quarter of 2051. Forecasts move from one analysis to the next, so treat the date as an estimate.

Neighboring area codes in Tennessee

The table shows how each code relates to 615, based on the NANPA, TRA, and FCC sources in this guide. Other Tennessee codes serve areas outside the sources checked, so the table does not claim to show every neighbor.

The 629 overlay that shares 615's territory

An overlay adds a new area code to the same geographic area, so existing numbers do not change. NANPA's planning letter calls 629 an all-services overlay: it covers every kind of service in the 615 area, not only wireless or a single city. NANPA set this schedule:

• December 19, 2013: network preparation and customer education begin.
• July 26, 2014: permissive ten-digit dialing begins.
• September 28, 2014: carriers can start ordering 629 central office codes from NANPA.
• February 28, 2015: ten-digit dialing becomes mandatory.
• March 28, 2015: earliest activation date for 629 codes, the effective date of the new code.

The TRA order says that once 615 runs out, all new central office code assignments come from the overlay code. Because the codes overlap, two neighbors on the same street can have different area codes. The TRA order says the overlay was the Tennessee industry's consensus recommendation.

Time zone and daylight saving time

Area code 615 uses Central Time. Tennessee is split between two zones. The federal rule for the boundary between the Eastern and Central zones (49 CFR 71.5) runs through East Tennessee along the west lines of Scott and Morgan counties, the north line of Roane County, and the west lines of Rhea and Hamilton counties. Nashville lies well west of that line. The tz database lists America/Chicago as "Central (most areas)" and America/New_York as "Eastern (most areas)".

NIST says daylight saving time begins at 2:00 a.m. on the second Sunday of March and ends at 2:00 a.m. on the first Sunday of November. The NIST page lists Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands, and Arizona as places that do not observe it, and Tennessee is not on that list. In 2026, NIST gives March 8 and November 1 as the change dates.

How to dial a 615 number

North American numbers have three parts: a country code, a three-digit area code, and a seven-digit local number. NANPA says the ITU assigned country code 1 to the NANP area. NANPA's dialing plan for 615 and 629 since February 28, 2015 is:

• Local calls: 10 digits (area code plus number). Providers may also allow 1 plus 10 digits.
• Toll calls: 1 plus 10 digits.
• Operator-assisted calls such as collect or credit card calls: 0 plus 10 digits.

NANPA's list of area codes that had to switch to ten-digit dialing for the 988 crisis line includes Tennessee's 731 and 865, but not 615, where local calls had already required ten digits since 2015. In its 2025 notice for the 423 overlay, the Tennessee Public Utility Commission (TPUC) says callers there can still dial three digits for 911 and 988. The 615 sources checked do not address this directly.

The same TPUC notice asks customers to reprogram equipment that stores seven-digit numbers, such as alarm systems, fax machines, speed dialers, and call forwarding settings. The same steps make sense in 615, where local calls also need ten digits.

Caller ID and scams with a 615 number

The FTC warns that "Scammers can make any name or number show up on your caller ID." That is called spoofing. Scammers can also match the first six digits of your own number, which the FTC calls neighbor spoofing.

• If you pick up and do not recognize the caller, the FTC advises that you hang up.
• Letting an unknown call go to voicemail is one option.
• The FTC says call blocking is your best defense against unwanted calls.

The sources checked do not say that 615 numbers are targeted more than others. A 615 number shows the code that was assigned, not who is calling or where they are. Because 629 shares the same area, a 629 caller can be just as local as a 615 caller, and neither code proves the caller is in Nashville.

Choosing a 615 number for a business

615 is the long-standing Nashville code, but the TRA order says that once 615 runs out, new central office codes come from 629. A new line in the area may carry 629 instead of 615, and the area code does not show which part of the region the business is in.

Because the two codes share territory, route calls by team or extension, not by area code. Ask your provider which code a new line gets, since that depends on its current inventory.

Whether a specific 615 number can be assigned to your business depends on your phone provider and its current inventory. This guide does not make claims about availability.

Important: Confirm availability with your provider before you plan a campaign or print a number on materials.

Before you use a 615 number

• Confirm the number is available from your provider, and get its terms in writing.
• Ask who owns the number and whether it can be moved to another provider if you switch.
• Confirm which area code your line uses. 615 and 629 serve the same area.
• Set 10-digit dialing for numbers in both codes before you go live, because local calls in 615 and 629 need ten digits.
• Update stored numbers on equipment that dials out, such as alarm systems and call forwarding, and print the full 10-digit number with the area code.
• Route calls by team or extension, because 615 and 629 share one territory.
• Plan for caller ID. A 615 number does not prove who is calling, and neighbor spoofing copies the first six digits of your own number.

Related guides and tools

• 404 area code guide: metro Atlanta, a large Southern metro with several overlay codes, for comparison with Nashville.
• 313 area code guide: Detroit, another city whose original code gained an overlay, for comparison with Nashville.
• 704 area code guide: Charlotte, another Southeast metro, for comparison with Nashville.
• What is a DID number?: what a DID is, local versus toll-free types and porting rules.
• Business phone number porting: how number porting works, how long it takes and how to prepare.
• Full list of U.S. area codes by state, with the overlay codes and time zone for every code.
• Browse all U.S. area code guides, including overlay codes that do not have their own guide yet.
• Business phone system and call routing for local numbers in Nashville.

Frequently asked questions