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Area Code 423 Location & Details

State / Region: Tennessee • Country: United States

Major Cities Covered: Chattanooga, Johnson City, Kingsport, Cleveland, Morristown, Bristol, East Ridge, Greeneville, Athens, Elizabethton

Standard Dial Format
+1 (423) XXX-XXXX
Country Code: +1 (NANP Format)
What State is Area Code 423?
TennesseeState Hub →
Country Territory
United States
423 Area Code Time Zone
Eastern / Central
423 Overlay Codes
729

Area Code 423 Geographic Map

Interactive location bounds and coverage area for Tennessee (Eastern / Central Timezone)

Lat: 35.87° • Lng: -84.00°
📍 Geographic Center: TennesseeMap data © OpenStreetMap contributors

Where is Area Code 423 Located?

Telephone area code 423 is assigned to Tennessee in United States. It serves cities and metropolitan communities including Chattanooga, Johnson City, Kingsport, Cleveland, Morristown, Bristol, East Ridge, Greeneville, Athens, Elizabethton.

Historical Context & Area Code Overlay Information:423 serves Tennessee (United States).

For local and long-distance calls within area code 423, standard 10-digit dialing (423) XXX-XXXX applies.

Who Called Me from Area Code 423?

Received an unknown call, missed call, or text scam from area code 423? Here is how to trace who is calling from 423 area code and verify unknown numbers safely:

1.
Identify Missed Calls & Voicemails:

Legitimate contacts usually leave a detailed voicemail or caller ID record.

2.
Watch Out for Neighbor Spoofing:

Robocallers often fake incoming caller ID numbers using your local 423 prefix to boost pick-up rates.

3.
Reverse Phone Lookup Area Code 423:

Search public white-pages or use caller intelligence guides before returning unfamiliar calls.

Learn How Reverse Phone Lookups Work→

How to Call Area Code 423 & Dialing Format

When placing a phone call to a number in area code 423, follow the correct dialing format depending on your calling location:

  • Calling from inside the US / Canada (+1): Dial 1 + (423) + 7-digit number.
  • Calling from an international location outside +1: Dial your country's international exit code (e.g. 011 in US or + on mobile) + 1 + 423 + 7-digit number.
  • Do I need to dial area code 423 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.

Top Cities & Municipalities Served in Area Code 423

Urban centers, census places, and communities within the +1-423 calling area

50 Major Cities Listed
City NameCountyPopulation% of 423 Pop
ChattanoogaHamilton County194,14428.3%
Johnson CityWashington County74,94310.9%
KingsportWashington County57,5308.4%
ClevelandBradley County51,1727.4%
MorristownHamblen County33,5174.9%
BristolSullivan County28,1074.1%
East RidgeHamilton County21,9213.2%
GreenevilleGreene County16,1412.3%
AthensMcMinn County15,2632.2%
ElizabethtonCarter County14,3502.1%
Soddy-DaisyHamilton County13,4742.0%
Red BankHamilton County12,4051.8%
CollegedaleHamilton County11,4991.7%
Signal MountainHamilton County8,8241.3%
DaytonRhea County7,8191.1%
Church HillHawkins County7,2971.1%
La FolletteCampbell County7,1761.0%
NewportCocke County7,0491.0%
JonesboroughWashington County6,9901.0%
SweetwaterLoudon County6,7061.0%

Counties Covered by Area Code 423

Geographic county distribution and population coverage across Tennessee

County NameTotal Population% of 423 Area% of County
Hamilton County387,26839.0%69%
Washington County139,57420.3%100%
Bradley County114,1147.4%45%
Hamblen County68,1774.9%49%
Sullivan County162,7094.4%18%
Greene County73,3453.2%30%
McMinn County56,7322.8%34%
Hawkins County59,4222.8%33%
Carter County57,3682.1%25%
Campbell County40,3252.0%34%
Rhea County34,7161.4%28%
Unicoi County17,9251.4%55%
Claiborne County32,9401.4%29%
Marion County29,7611.2%28%
Cocke County37,7361.0%19%
Loudon County62,6421.0%11%
Monroe County49,3381.0%14%
Sequatchie County17,6090.9%35%
Scott County22,5530.8%25%
Johnson County18,5220.4%13%
Bledsoe County15,5730.3%12%
Meigs County13,9900.2%12%

☎️Area Code 423 Exchange Prefixes & Carriers

Showing 50 of 777 central office 3-digit prefixes and assigned telecom carriers

62% Landline27% Wireless12% VoIP
PrefixLine UsageRate CenterAssigned CarrierAssign Date
(423) 200-📞LandlineMORRISTOWNLEVEL 3 COMMUNICATIONS, LLC - TN07/18/2002
(423) 201-📞LandlineLAFOLLETTELEVEL 3 COMMUNICATIONS, LLC - TN07/18/2002
(423) 202-📞LandlineJOHNSON CYMCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN12/16/2003
(423) 203-📞LandlineCHATTNOOGABOOST SUBSCRIBERCO L.L.C.02/03/2022
(423) 204-📞LandlineXXXXXXXXXXBELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TELN/A
(423) 205-💻VoIPETOWAHONVOY, LLC - TN03/09/2016
(423) 206-📞LandlineCHATTNOOGAELECTRIC POWER BOARD OF CHATTANOOGA11/30/2018
(423) 207-📞LandlineMIDWAYLEVEL 3 COMMUNICATIONS, LLC - TNN/A
(423) 208-📱WirelessCHATTNOOGANEW CINGULAR WIRELESS PCS, LLC - GA11/01/2006
(423) 209-📞LandlineCHATTNOOGABELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TELN/A
(423) 210-📱WirelessTELLICO PLUNITED STATES CELLULAR - TNN/A
(423) 211-📞LandlineXXXXXXXXXXMULTIPLE OCN LISTINGN/A
(423) 212-📞LandlineBLOUNTVLLEVEL 3 COMMUNICATIONS, LLC - TN07/18/2002
(423) 213-📱WirelessELIZABTHTNSUNCOM DBA T-MOBILE USA11/07/2001
(423) 214-📱WirelessENGLEWOODUNITED STATES CELLULAR - TNN/A
(423) 215-📱WirelessONEIDACELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN12/03/2004
(423) 216-📞LandlineBENTONPAETEC ITEL, LLC04/28/2005
(423) 217-📞LandlineBRISTOLLEVEL 3 COMMUNICATIONS, LLC - TN07/18/2002
(423) 218-📞LandlineJOHNSON CYLEVEL 3 COMMUNICATIONS, LLC - TN07/18/2002
(423) 219-📞LandlineCHARLESTONTELEPORT COMMUNICATIONS AMERICA, LLC - TN10/01/2019
(423) 220-📞LandlineERWINPAETEC ITEL, LLC04/04/2001
(423) 221-📞LandlineCHATTNOOGASPOK, INC.N/A
(423) 222-📱WirelessPIKEVILLENEW CINGULAR WIRELESS PCS, LLC - GA04/21/2022
(423) 223-📱WirelessONEIDANEW CINGULAR WIRELESS PCS, LLC - GA11/30/2006
(423) 224-📞LandlineKINGSPORTUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 225-💻VoIPBENTONBANDWIDTH.COM CLEC, LLC - TNN/A
(423) 226-💻VoIPCHURCHHILLBANDWIDTH.COM CLEC, LLC - TN05/28/2010
(423) 227-📞LandlineCHATTNOOGAPOWERTEL ATLANTA LICENSES, INC.N/A
(423) 228-📞LandlineSO PITTSBGPAETEC ITEL, LLCN/A
(423) 229-📞LandlineKINGSPORTUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 230-📞LandlineKINGSPORTUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 231-📱WirelessMORRISTOWNNEW CINGULAR WIRELESS PCS, LLC - GAN/A
(423) 232-📞LandlineJOHNSON CYUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 233-📞LandlineJOHNSON CYPRO PAGE PARTNERS, LLCN/A
(423) 234-📞LandlineBAILEYTONUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 235-📞LandlineBULLS GAPBELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TELN/A
(423) 236-📞LandlineAPISONBRIGHTSPEED OF SOUTHERN TENNESSEE, LCN/A
(423) 237-📱WirelessNEWPORTNEW CINGULAR WIRELESS PCS, LLC - GAN/A
(423) 238-📞LandlineOOLTEWAHBRIGHTSPEED OF SOUTHERN TENNESSEE, LCN/A
(423) 239-📞LandlineMIDWAY SULUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 240-📱WirelessCHATTNOOGACELLCO PARTNERSHIP DBA VERIZON WIRELESS - TNN/A
(423) 241-📱WirelessCOPPERBSINCELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN04/11/2003
(423) 242-📞LandlineCHATTNOOGATELEPORT COMMUNICATIONS AMERICA, LLC - TNN/A
(423) 243-📞LandlineSODDYDAISYTELEPORT COMMUNICATIONS AMERICA, LLC - TNN/A
(423) 244-📞LandlineCLEVELANDTELEPORT COMMUNICATIONS AMERICA, LLC - TNN/A
(423) 245-📞LandlineKINGSPORTUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 246-📞LandlineKINGSPORTUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 247-📞LandlineKINGSPORTUNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TNN/A
(423) 248-📱WirelessNEWPORTUNITED STATES CELLULAR - TNN/A
(423) 249-📞LandlineFORK RIDGEBELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TELN/A

Frequently Asked Questions about Area Code 423

Where is area code 423 located?

Area code 423 is located in Tennessee (United States), serving cities like Chattanooga, Johnson City, Kingsport, Cleveland, Morristown, Bristol, East Ridge, Greeneville, Athens, Elizabethton.

What timezone is area code 423?

Area code 423 operates in the Eastern / Central timezone.

What state is area code 423?

Area code 423 is assigned to the state / telecom territory of Tennessee.

Is area code 423 a scam or dangerous?

Area code 423 is an official geographic area code for Tennessee. However, beware of robocaller spoofing.

Tennessee State Area Codes

View complete directory of telephone area codes assigned to Tennessee.

Explore Tennessee Directory

Get a 423 Business Phone Number

How to acquire a virtual phone number or business line with area code 423 for local customer trust in Tennessee.

Get 423 Business Number
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Overlay & Nearby Area Codes for Tennessee

Explore neighboring telecom prefixes sharing geographical boundaries with area code 423.

729
Eastern / Central
Area Code 729
Chattanooga, Johnson City, Kingsport, Cleveland, Morristown, Bristol, East Ridge, Greeneville, Athens, Elizabethton
615
Eastern / Central
Area Code 615
Nashville-Davidson Metropolitan Government (balance), Murfreesboro, Franklin, Hendersonville, Smyrna, Gallatin, Lebanon, Brentwood, Mount Juliet, La Vergne
629
Eastern / Central
Area Code 629
Nashville-Davidson Metropolitan Government (balance), Murfreesboro, Franklin, Hendersonville, Smyrna, Gallatin, Lebanon, Brentwood, Mount Juliet, La Vergne
731
Eastern / Central
Area Code 731
Jackson, Dyersburg, Martin, Union City, Paris, Brownsville, Milan, Lexington, Humboldt, Savannah
865
Eastern / Central
Area Code 865
Knoxville, Bartlett, Oak Ridge, Maryville, Farragut, Sevierville, Lakeland, Alcoa, Lenoir City, Clinton
901
Eastern / Central
Area Code 901
Memphis, Bartlett, Collierville, Germantown, Arlington, Millington, Oakland, Atoka, Covington, Munford