Area code 423: Chattanooga, Tennessee
Area code 423 is a Tennessee code serving Chattanooga, Johnson City and Kingsport, on Eastern Time. It overlays 729, so numbers in the same area may start with any of them. From abroad, dial +1 423 and the 7-digit number.
Updated
At a glance
- State
- Tennessee
- Places served
- Chattanooga, Johnson City, Kingsport
- Time zone
- Eastern TimeUTC−5, UTC−4 in summer
- Overlay codes
- 729Same area, assigned when numbers ran short.
- Country
- United States (+1)
- Number format
- (423) 555-0123+1 423 555 0123 in international format
How to call a 423 number
All +1 numbers are 10 digits: the 3-digit area code and a 7-digit local number.
| Calling from | Dial |
|---|---|
| Inside the US or Canada | 1 423 555 0123 |
| The UK and most of Europe | 00 1 423 555 0123 |
| Australia | 0011 1 423 555 0123 |
| Any mobile | +1 423 555 0123 |
555-0123 is a placeholder; use the real 7-digit number.
Get a (423) number without living there
A callmins US number costs $2.00/month, no setup fee. It rings in your browser or the callmins app anywhere in the world, receives texts, and needs no ID or local address. When you buy, search by area code to look for a 423 number.
Availability changes daily
Popular codes sell out. If there's no 423 number free, try the overlay code 729 or another Tennessee code below. US numbers don't receive WhatsApp codes; use a UK number for that.
Other Tennessee area codes
Questions people ask
Where is area code 423?
Area code 423 is in Tennessee, the United States. It serves Chattanooga, Johnson City and Kingsport, and shares the same area with 729 (overlay codes).
What time zone is area code 423?
Area code 423 is on Eastern Time (UTC−5, UTC−4 in summer). Where an area straddles a time-zone line, this is the time most of its callers keep.
How do I call a 423 number from abroad?
Dial your exit code, then 1, then 423 and the 7-digit number: 00 1 423 from the UK and most of Europe, or +1 423 from any mobile. Inside the US and Canada, dial 1 423 and the number.
Is a call from area code 423 a scam?
423 is an ordinary geographic area code, not a premium-rate or toll-free one. But caller ID can be faked, so a familiar-looking local code proves nothing about who is calling. Don't share codes or payment details with an unexpected caller.
Can I get a 423 phone number?
You can search callmins for a 423 number when you buy a US number ($2.00/month, no setup fee). Which area codes have numbers free changes daily; if 423 has none, pick a nearby or overlay code such as 729.
Related
A 423 number, in your browser.
$2.00/month, no setup fee. Calls and texts on your laptop or phone, from anywhere.
Area code details are compiled from North American Numbering Plan assignments and list the best-known places served; check NANPA for the full boundary.