ZIP code 40121
Where is ZIP code 40121?
Fort Knox, Kentucky
Hardin County · Standard ZIP code
ZIP code 40121 belongs to Fort Knox, Kentucky in Hardin County. 40121 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Eastern Time zone and uses area codes 270, 364 and 502. About 8,836 people live in the 40121 area, where the median household income is $82,663. The closest ZIP codes are 40122 (Fort Knox, 0.8 mi west), 40155 (Muldraugh, 3.9 mi northwest) and 40175 (Vine Grove, 3.9 mi southwest).
| ZIP code | 40121 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Fort Knox |
| State | Kentucky (KY) |
| County | Hardin County |
| Time zone | Eastern Time · now |
| Area codes | 270, 364, 502 |
| Coordinates | 37.8928, -85.9489 map |
| 3-digit prefix | 401 |
Population and income in 40121
| Population | 8,836 · higher than 81% of Kentucky ZIP codes |
|---|---|
| People per square mile | 251 · higher than 83% of Kentucky ZIP codes |
| Median age | 24 years · lower than 97% of Kentucky ZIP codes |
| Men / women | 55% / 45% |
| Median household income | $82,663 · higher than 88% of Kentucky ZIP codes |
| Income per person | $32,370 |
| Below the poverty line | 9.0% |
| Bachelor’s degree or higher | 48% of adults 25+ |
| Median rent | $1,502 a month |
| Housing units | 2,497 |
| Households | 2,226 (3.22 people on average) |
| Owners / renters | 0.0% / 100% |
| Land area | 35.22 sq mi (plus 0.08 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 40121. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 40121
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 40122 | Fort Knox, KY | 0.8 mi W | Standard |
| 40155 | Muldraugh, KY | 3.9 mi NW | Standard |
| 40175 | Vine Grove, KY | 3.9 mi SW | Standard |
| 40160 | Radcliff, KY | 4.6 mi S | Standard |
| 40177 | West Point, KY | 7.1 mi N | Standard |
| 40162 | Rineyville, KY | 10 mi S | Standard |
| 40108 | Brandenburg, KY | 10.1 mi NW | Standard |
| 40117 | Ekron, KY | 11.3 mi W | Standard |
| 40159 | Radcliff, KY | 11.8 mi S | PO Box only |
| 40150 | Lebanon Junction, KY | 12.6 mi E | Standard |
| 47135 | Laconia, IN | 13.3 mi NW | Standard |
| 40272 | Louisville, KY | 14.3 mi N | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 40121 or measure the distance to another ZIP code.
How to address mail to 40121
123 MAIN ST
FORT KNOX KY 40121
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (40121-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Fort Knox, KY
All Fort Knox ZIP codes with population and income →
Questions
- What city is ZIP code 40121?
- 40121 is a Fort Knox, Kentucky ZIP code.
- What county is 40121 in?
- ZIP code 40121 is in Hardin County, Kentucky.
- What time zone is ZIP code 40121 in?
- 40121 is in the Eastern Time zone (America/New_York).
- What area code is 40121?
- Phone numbers in ZIP code 40121 use area codes 270, 364 and 502.
- What is the population of ZIP code 40121?
- About 8,836 people live in ZIP code 40121, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 40121?
- The median household income in 40121 is $82,663 a year, higher than 88% of Kentucky ZIP codes.
- What ZIP codes are near 40121?
- The nearest ZIP codes to 40121 are 40122 (Fort Knox, 0.8 miles), 40155 (Muldraugh, 3.9 miles), 40175 (Vine Grove, 3.9 miles) and 40160 (Radcliff, 4.6 miles).