Hamilton County · Tennessee
Chattanooga, TN area codes and time zone
Quick answer
Chattanooga is served by area code 423, keeps CST time (GMT-5), and sits in county FIPS 47065.
- Area code
- 423Within 25 miles of the city centre
- Time zone
- CSTAmerica/Chicago
- UTC offset
- GMT-5CDT in summer
- County FIPS
- 47065Hamilton County
Dialling from and to Chattanooga
What this means when you pick up the phone.
Local calls inside 423 may still work on seven digits, but ten-digit dialling is the safe default everywhere in the country now. From abroad, dial +1 then the ten digits.
More on Chattanooga
Other reference data for this city.