The Commonwealth of Kentucky is divided into four geographically distinct numbering plan areas (NPAs) of the North American Numbering Plan (NANP), which are served by five area codes, with one NPA configured as an overlay complex of two area codes.
Area code Yearcreated ParentNPA Overlay Numbering plan area 502 1947 – – Louisville and Frankfort 606 1954 502 – Eastern Kentucky, including the Eastern Coalfield 859 1999 606 – Lexington area and Northern Kentucky 270 1999 502 270/364 Western Kentucky and the western half of South Central Kentucky 364 2014 270
See also List of North American Numbering Plan area codes List of future North American area codes