Area codes in Morristown, Tennessee
Morristown, Tennessee uses 2 area codes — 423 and 729. The main Morristown area code is 423.
Area codes serving Morristown
Phone numbers in Morristown are written as ten digits — for example (423) 555-0190 — and fall in the Eastern Time zone.
How Morristown came to have 2 area codes
The original Morristown area code is 423, in service since 1995. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 729 (2025). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Morristown now uses all 2 codes and every local call is dialed with ten digits.
All Tennessee area codes · Is a Morristown call a scam?
Nearby cities
- Knoxville area codes
- Maryville area codes
- Kingsport area codes
- Johnson City area codes
- Asheville area codes
- Hickory area codes
- Spartanburg area codes
- Cookeville area codes
More cities in Tennessee
- Nashville area codes
- Memphis area codes
- Chattanooga area codes
- Clarksville area codes
- Murfreesboro area codes
- Hendersonville area codes
Frequently asked questions
What is the area code for Morristown?
The main area code for Morristown, Tennessee is 423. Morristown is now served by 2 area codes in total: 423, 729.
How many area codes does Morristown have?
Morristown has 2 area codes: 423, 729.
Why does Morristown have more than one area code?
As Morristown used up the numbers available in its original area code (423, in service since 1995), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Morristown number?
Dial all 10 digits — the area code (423 or 729) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.