A new area code, 729, will soon join the existing 423 area code serving a portion of Eastern Tennessee. The 423 area code is expected to run out of new numbers in the third quarter of 2025 and the new 729 code will ensure residents and businesses have access to a sufficient supply of telephone numbers to serve this area.
Existing customers will keep their current telephone numbers, but new customers, or requests for additional lines, may be assigned the new 729 area code once it is activated. Customers will continue to use 10-digit dialing – the area code plus the seven-digit phone number – to make all calls.