ZIP code · Fort Knox · Kentucky · United States
ZIP code 40121 — Fort Knox
ZIP code 40121 serves Fort Knox, Kentucky.
- Postal code
- 40121Single source Value from one source, not cross-checked.
- City
- Fort Knox
- County
- Hardin
- State
- Kentucky
- Country
- United States
- Coordinates
- 37.8928, -85.9489 — precision precise (locality)
View on OpenStreetMap - Population
- 8,715 (ZCTA, ACS 5-year)
- Median household income
- $74,224
- Median age
- 24.3
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Data generated on 2026-08-21. Methodology · Report an error on this page