Grays Knob, KY is a city located in Harlan County, Kentucky and has a land area of 5.25 square miles (13.60 km2). The water area for the city is 0.06 square miles or 0.16 km2. There is one unique zip code in Grays Knob, Kentucky and it is 40829. The area code(s) for Grays Knob is 606.
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