Area Code Atlas

Creation of area code 606 from 502

In 1954, Kentucky's eastern region was assigned area code 606, splitting from the original 502 area code. This split initially comprised the entire eastern half of Kentucky, including Lexington and Northern Kentucky, reducing 502 to the central and western portions of the state.

NPA 859 split from 606

Area code 859 was created in 1999 from a split of area code 606, serving Lexington and central Kentucky. The split allowed the rural eastern region to retain 606, while the more populous central region adopted 859, including Northern Kentucky.

606 NPA Split, Creating 859 NPA - Kentucky

NPA 606 projected exhaust

As of 2022, area code 606 was not projected to exhaust until about 2034, according to the North American Numbering Plan Administrator.