Jonesborough, TN is currently using one area code which is area code 423. Area Code 423 was created from a split of area code 615 and was placed into service on September 11, 1995.
In addition to Jonesborough, TN area code 423 serves two distinct geographic areas in Tennessee that are not contiguous, including the larger cities and communities of Bristol, Johnson City and Kingsport in northeastern Tennessee and Chattanooga and Cleveland in the southern areas in addition to many smaller communities.
Jonesborough, TN is located in Washington County and observes the Eastern Time Zone. View our Times by Area Code tool.