423 Area Code: Details, Map, Location, Time Zone & More

423 Area Code: Details, Map, Location, Time Zone & More

Area code 423 is the area code for central Tennessee, north and south of Knoxville. It includes the cities of Chattanooga, Johnson City, and Kingsport. It is the only area code that serves the area. The 423 area code is located in the Eastern and Central timezones. The Eastern time zone is also known as America/New_York. The Central time zone is also known as America/Chicago.

423 was first put in service September 11, 1995. It was created from area code 615. 423 was split in 1999 creating the need to update some of the phone numbers to area code 865.

Suppose you are called by a 423 number for the first time, what suspicions are likely to develop in your mind? Wondering about the location of the caller, the number’s legitimacy plus whether the call is a scam or not and much more must definitely rank high.

Where Is The 423 Area Code?

The 423 area code is a telephone area code in the North American Numbering Plan for the US state of Tennessee It comprises two disconnected areas of eastern Tennessee that are separated by the 865 area code.

The major cities in the northern part of the area code region are Morristown, Greeneville, Kingsport, Johnson City, and Bristol (more commonly known as the Tri-Cities region). The major cities in the south are Chattanooga and Cleveland.

When the North American Numbering Plan was created in 1947, Tennessee was a single numbering plan area (NPA) with the 901 area code. In 1954, 901 was shortened to West Tennessee, while the eastern part of the state received area code 615.

In 1995, the eastern portion of 615, including Knoxville, Chattanooga, and the Tri-Cities, was divided as area code 423. This was the first new area code in the state in 41 years.

The boundary between 423 and 615 roughly followed the line between the eastern and central time zones; Overall, Tennessee’s share of the Eastern Time Zone was 423.

As a result, the state’s three area codes were roughly coextensive with Tennessee’s traditional Grand Divisions. The new 423 served nearly all of East Tennessee, with 615 serving Middle Tennessee and 901 serving West Tennessee.

The Tennessee Regulatory Authority intended this setup to be a long-term solution. Yet in just three years, 423 was already close to exhaustion due to the proliferation of cell phones and pagers, particularly in Knoxville and Chattanooga.

It soon became clear that East Tennessee needed another area code, although this would have forced many residents and businesses to change their numbers for the second time in a decade.

It was decided to create the 865 area code for Knoxville and most of East Central Tennessee effective November 1, 1999. Permissive dialing of 423 continued throughout eastern Tennessee until April 22, 2000.

When the plans for the division were being drawn up, it was discovered that the Tri-Cities had too much traffic to follow Knoxville to 865, but were not large enough for their own area code.

This left the Tennessee Regulatory Authority with two options: a split plan that would create two non-contiguous sections of 423, or turn 865 into an overlap for all of eastern Tennessee.

The Tennessee Regulatory Authority opted for the second option, as overlays were a new concept at the time and had encountered some resistance due to the need to dial with ten digits.

Normal practice would have required Knoxville to retain 423, as it was the largest city in the old 423 territory.

However, the Tennessee Regulatory Authority requested that the Knoxville numbering plan area receive 865 because on an alphanumeric phone keypad, those numbers correspond to VOL (Volunteers), the nickname for the University of Tennessee sports teams.

This created one of the few area codes in the nation that is not contiguous, as 865 is almost entirely surrounded by 423 except in the east. Although this appeared to be a temporary fix, the North American Numbering Plan Administration initially determined that the reconfigured 423 would not be sold out until approximately 2010.

However, with the 2002 implementation of the number combination in the southern part of the area code (the Chattanooga area), the Tennessee Regulatory Authority now projects that 423 will remain in its unusual and non-contiguous state until at least 2027.

423 Area Code Time Zone

Standard Time Zone: UTC/GMT -6:00 Hours
Daylight Saving Time: +1:00 Hour
Current Time Zone Offset: UTC/GMT -5:00 Hours
Time Zone Abbreviation: CDT

Map of 423 Area Code

Is 423 a scam?

In this age of intense phone activity, the possibility of being scammed and therefore the need to be on high alert cannot be ruled out. With regard to the 423 area code, there is a security measure.

If you suspect a fraudulent phone call and/or annoying text message from the 423 area code, simply run a reverse phone lookup on any phone number that begins with 423 to find out what other users have reported about it. And this is courtesy of CallerSmart users.

Is Area Code 423 Toll-Free?

There are known to be quite a few toll-free area code numbers, such as 800, 833, 844, 855, 877, and 888. These numbers are typically associated with multiple company customer service lines, but can be used by other parties as well.

And they are regulated by the FCC, which is the Federal Communications Commission. Unfortunately, the 423 area code is not among those listed as belonging to the toll-free area code numbers in Tennessee.

How to block unwanted 423 calls

If you do not want to receive any calls from 423 numbers, simply follow the steps hereunder:

For iPhone users:

Click the encircled ‘i’ in your calls menu
Click on ‘more information’
Click on ‘block this number’ and that is it.

For Android users:

Visit ‘recent calls’
Click on ‘details’
Click ‘block number’ and you are done.

How do I get my own 423 number for business?

Although the 423 area code is not free, getting your own business number is still plausible because this is a way to build a relationship with your customers because you can reach your customers from virtually anywhere in the world, just as they can communicate with Your clients. You from wherever they are.

What is Nashville Tennessee’s area code?

Area code 615 Nashville/Area codes

Area codes 615 and 629 are area codes in Tennessee serving Nashville (Davidson County) and the 12 surrounding counties. 615 is the main area code, while 629 is an overlay covering the same area that began service in 2014.

Is 10-digit dialing required for local calls within the 423 area code?

Yes, 10-digit dialing is mandatory for all local calls made within the 423 area code. This includes the area code plus the 7-digit phone number.

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423 Area Code: Details, Map, Location, Time Zone & More