Tennessee Announces Overlay for 423 Area Code

The new 729 area code will overlay the existing 423 area code in eastern Tennessee. The Tennessee Public Utility Commission issued a news release about this overlay recently. We want to make your organizations aware of the upcoming key dates for the overlay implementation:

• August 5, 2024: Permissive 7- or 10-digit dialing begins for customers with the 423 area code
• February 5, 2025: Mandatory 10-digit dialing begins for customers with the 423 area code
• March 5, 2025: The new 729 area code becomes effective, and mandatory 10-digit dialing is required in the new 729 area code too

Read the notice HERE