Fort Knox, KY ZIP Codes, Area Codes and Address Format

City guides  |  April 25, 2026  |  2 min read

Fort Knox sits in Hardin County, Kentucky. It uses 2 standard ZIP codes and the 270, 364 and 502 area codes.

State

Kentucky (KY)

County

Hardin County

Standard ZIP codes

2

Time zone

Eastern

Fort Knox ZIP codes

These are the standard delivery ZIP codes for Fort Knox. The city has 2 ZIP codes in total when PO Box and unique codes are included.

• 40121
• 40122

Area codes in Fort Knox

Fort Knox phone numbers use 270, 364 and 502. With more than one code in use, residents on the same street can have different area codes.

Sample Fort Knox addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Fort Knox

• End the address with FORT KNOX, KY and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Fort Knox has 2 codes, so the city name alone is not enough.

More Kentucky cities

Adairville, Adolphus, Paducah, Bowling Green, Lexington, or see all Kentucky cities.