ZIP Code 40121

ZIP code 40121 is classified by USPS as a standard delivery area and covers roughly 87.7 square miles in Fort Knox, Hardin County, Kentucky. The area is home to 10,124 residents, producing a population density of 115 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 40121 against Kentucky and the nation.

On the economic side, the median household income for ZIP 40121 sits at $82,663 (39% above the Kentucky average), while per-capita income is $32,370. The poverty rate stands at 9.0% and the unemployment rate at 5.3%. On housing, the median home value is — with median rent at $1,502 per month, and 0.0% of occupied units are owner-occupied, a direct signal of whether 40121 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 48.3% of adults hold a bachelor's degree or higher, the median age is 24, and the average commute is 12 minutes. We also surface 5 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Hardin County, so you can benchmark 40121 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →