ZIP code 40121: Fort Knox, KY
40121 is a ZIP code in Fort Knox, Kentucky, mainly in Hardin County, part of the Elizabethtown, KY metro area. About 8,836 people live here.
- Population
- 8,836
- Median household income
- $82,663
- Typical home value
- —
- Median rent
- $1,502gross, per month
- Median age
- 24
- Homeowners
- 0%of occupied homes
Shaded: ZIP code 40121's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 40121 details
| City | Fort Knox |
|---|---|
| State | Kentucky |
| County | Hardin County (also partly Meade County) |
| Metro area | Elizabethtown, KY |
| Time zone | Eastern Time (UTC−5), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 35.2 sq mi, plus 0.1 sq mi of water |
| Population density | 251 people per sq mi |
| Bachelor's degree or higher | 48.3% of adults 25+ |
| Average commute | 12.4 minutes |
| Center coordinates | 37.92690, -85.95981 |
Median rent in 40121 by bedrooms
| Size | Median gross rent |
|---|---|
| Studio | $493/mo |
| 2 bedrooms | $1,016/mo |
| 3 bedrooms | $1,506/mo |
| 4 bedrooms | $1,843/mo |
| 5+ bedrooms | $1,861/mo |
Gross rent includes utilities paid by the tenant. ACS 2020–2024; sizes with too few rentals to estimate are left out.
ZIP codes near 40121
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 40155 | Muldraugh, KY | 2.4 mi | 1,127 |
| 40122 | Fort Knox, KY | 2.5 mi | — |
| 40177 | West Point, KY | 5.6 mi | 1,523 |
| 40160 | Radcliff, KY | 8.0 mi | 23,624 |
| 40117 | Ekron, KY | 9.2 mi | 2,050 |
| 40175 | Vine Grove, KY | 10.3 mi | 15,718 |
| 47135 | Laconia, IN | 10.5 mi | 1,257 |
| 40272 | Louisville, KY | 12.0 mi | 38,289 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
About ZIP code 40121
What city is ZIP code 40121?
ZIP code 40121 is in Fort Knox, KY, in Hardin County.
What county is ZIP code 40121 in?
40121 is mainly in Hardin County, Kentucky, and partly in Meade County.
What is the population of ZIP code 40121?
About 8,836 people live in ZIP code 40121, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 40121 in?
40121 is in Eastern Time (UTC−5). It observes daylight saving time.
What other ZIP codes does Fort Knox have?
Fort Knox, KY also uses 40122.