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In 1995, the eastern portion of 615, including Knoxville, Chattanooga, and the Tri-Cities, was split off with area code 423. This was the first new area code in the state in 41 years. The boundary between 423 and 615 roughly followed the line between the Eastern and Central time zones; generally, Tennessee's share of the Eastern Time Zone was ...
Time zone: UTC-5 (Eastern (EST)) • Summer : UTC-4 (EDT) ZIP code: 37650. Area code: 423: FIPS code: 47-24360 [7] GNIS feature ID: 1328148 [8] Website: erwintn.org:
In September 1995, most of the eastern portion of 615—including Chattanooga, Knoxville, and the Tri-Cities—was assigned area code 423. The dividing line between 615 and 423 mostly tracked along the boundary between the Eastern and Central Time Zones; generally, Tennessee's share of the Eastern Time Zone transferred to 423.
Tennessee Public Utility Commission approved a new 729 area code for the existing 423 region in eastern Tennessee. The change goes into effect Aug. 5. If you have a 423 number, don't worry.
area code 387 is reserved as a fifth code for the region; 438: Quebec (Montreal metropolitan area) November 4, 2006: overlaid on 514; 2022: overlaid by 263; 439: not in use; available for geographic assignment 440: Ohio (surrounding Cleveland on three sides, including: Elyria, Lorain, Oberlin, Ashtabula, and most of north-central Ohio) August ...
Numbering plan areas and area codes since May 2001 September 1997 [1] – May 2001 [2] July 1988 [3] – September 1997 [4] [5] October 1947 – July 1988 [6]. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [7] organized as four overlay complexes and a single-area code NPA.
Map of all Tennessee area codes. 423 - Chattanooga, Johnson City, Kingsport, Bristol: Initially split from 615 in 1995. 615 and 629 (overlay) - Greater Nashville, including Murfreesboro, Mount Juliet: 615 initially split from 901 in a 1954 flash-cut. The 629 overlay for the entire area code was made effective in 2015
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...